Shimano SPD-SL pedal body wear: R540 vs 5700 longevity

Been using R540 for years due to the low price but the aluminium body seems to get worn down by the cleats pretty quickly. See wear pattern below:

(this is a really old pedal - photo just for example - I replace them before they get this bad)
Whereas the 105s have a steel plate which supposedly prevents this

I just got some of the above 5700 pedals - just wondering if anyone has experience of using both pedals and if the 5700s last much longer than the R540s before getting worn to the point of not being usable anymore. Just trying to find out if this plate actually works well and if they are worth the extra 50% in price.
(edited due to not making it clear what I was asking)

(this is a really old pedal - photo just for example - I replace them before they get this bad)
Whereas the 105s have a steel plate which supposedly prevents this

I just got some of the above 5700 pedals - just wondering if anyone has experience of using both pedals and if the 5700s last much longer than the R540s before getting worn to the point of not being usable anymore. Just trying to find out if this plate actually works well and if they are worth the extra 50% in price.
(edited due to not making it clear what I was asking)
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I have done 10,000 on my first set and still going.
http://100hillsforgeorge.blogspot.com/
http://www.12on12in12.blogspot.co.uk/
If the 5700s last 50% longer or more, then it's worth the upgrade...
The actual body of the pedals is wearing, you can see it is from the cleat rotating when I clip in and out.
Specialized Secteur Elite
In fact all Shimano pedals use the same cleat and bearing assembly so all you are paying for with the higher range is less weight and a fancy sticker.
If you are happy with this then fine, I have Ultegra pedals on the Basso and I can honestly not tell one iota of difference from those to the 540's in use on my CAAD.
As for wear, the only difference is the plate, everything else is the same.
aint that the case with virtually everything in the cycle world !
True..but these are pedals FFS! :roll:
I have experienced much faster wear rate on the 540, as if the balls were of inferior quality
2003 Specialized Allez Sport
It has to be said that the R540 are amazing value and are not far off the quality of the PD-670.
I do have to admit the more expensive pedals look better and also feel better made (if that the right word) when clipping in. I will buy the R540 again but will keep similar pedals to the PD-670 on the "best bike".
As people have stated - if you keep a look out for offers then bargains always seem to come up pretty often for pedals. If you use reasonable quality pedals, when they are 'failing' - you usually get about 6 months notice to do something about it!
Well, I can only go by the shimano tech docs. They suggest they are the same, but I have not stripped any to verify.
They even use the same in the Mountian bike pedals too.
If you think about it why would they use different bearings in each pedal - way too many parts to stock.
I'm sure the axle they use on the 105's is shared with the Ultegra's and nothing else in the Shimano range, could be wrong though.
for the sake of of a few pounds try it?
Slight wear to the front corners of the plate but no wear to the pedal face. Probably get 5,000 more out of them yet.
I would say that is well worth £25.
I run R540's on both of my road bikes. BOTH bikes right pedal pretty much wore out at the same time for me and also at the same mileage (logged 3500 miles on both bikes before the annoying click of death per pedal rotation!)
In an attempt to gain a little more life from them, I mixed a little Araldite adhesive and "built up" the worn plastic bed of the pedal but realised they still clicked. Interesting to here about the gaffer tape trick on the front hoop of the pedal, I'm now off into the garage to try that out and see if it cures the clicking.
To be fair, at £20 delivered with a set of yellow cleats too, I'll probably replace both sets with another double order of the same. I was contemplating the 550's but I do tend to ride in all weathers and through the Winter. I think the salt/grit and rain trapped between the cleat and pedal accelerate wear as you've essentially got a grinding paste working away much like brake blocks/rims in poor weather. I'd think the really expensive carbon pedals would suffer the same fate regarding the clicking inherited if that front is responsible for the noise induced once worn out slightly?
2007 Specialized Allez (Double) FCN - 3
Does is really work with the tape on the pedal?
I think my last set came very cheaply from a small online shop in France, and very easy to replace once you find the hole on the bottom of the pedal to push the old plastic cover out.
EDIT: Such as these http://www.jejamescycles.co.uk/shimano- ... 41271.html
I noticed when my shoes would pivot sideways more easily and before long they would un-clip themselves whilst riding along.
Tape does work, but you soon end up having to re-tape every other week or so as they take a beating. I'm not sure if the plastic covers above would work, as the wear is actually on the pedal where the front of the cleat 'hooks'.
Do 105's and up last longer??? I am about 9 months and 4k miles into my latest set of R540 and already noticing my left pedal wearing. I know for £20 with cleats included it's no biggie, but would consider paying more to get extended life.
This morning I changed my pedals of an other bike and noticed no worn. I will try the tape but as I understand it will works for maybe one ride.
I use the 6700 SPD SL pedals and the left one got wear after + 15.000 klm.
My left feet does float more than the other one.
I have spd sl pedals of 1 year old and have the same sloppy problems. You wrapped the front edge of the pedal. Is it possible to get a picture of it how you did it? You have still good results with it?