Powertap Help Please

All,
have to decided to get a powertap instead of getting some carbon wheels for racing as I think it will be more useful.
Now I have a garmin 500 that I will use. So what I want to know is which powertap would be most suitable.
I have been offered a secondhand 2009 Elite+, I have read some reports of this only recording power etc and not giving live feed. Is this only when using a offical powertap cpu or is it the hub?
Any help would be great
have to decided to get a powertap instead of getting some carbon wheels for racing as I think it will be more useful.
Now I have a garmin 500 that I will use. So what I want to know is which powertap would be most suitable.
I have been offered a secondhand 2009 Elite+, I have read some reports of this only recording power etc and not giving live feed. Is this only when using a offical powertap cpu or is it the hub?
Any help would be great

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I'm not bothered about weight as it will only be a training wheel.
More useful than your race wheels though no?
I disagree. Not useful for pacing obviously, but useful data to look at after the race.
If I was doing TT's that I can see a powertap (or other power meter) being a big help for know how hard to push to last the distance. But I don't race TT's.
But I think for me personally it will benefit me more from training with it, then getting a pair of 50mm tubs just to use once a week.
Knowing what I'm like I will probably end up buying a powertap hub to lace to a race wheel :roll:
But for a newbie to power I don't think it is worth me spending lots and lots of ££££ to get a powertap I can race on when I have been offered a year old elite+ for £350 that I can use as a training wheel
The second hand elite+ I have been offered is a campag free hub. I run shimano. I saw the new free hubs here http://www.cyclepowermeters.com/powertap-12mm-axle-steel-freehub-body-559-p.asp
I just rang the LBS to ask how much it would be to change the freehub, (fully booked next week so doubt I would get a chance to do it) and they said they would have to send it back to Paligap to get done because it would effect the power readings if they just did it in their workshop.
Is this true or just a load of bulls**t??
The oldest freehubs had to be sent back, I'm not sure what the vintage of the easily replaceable one is. Call up Bob at CyclePowerMeters and he'll let you know. But I do think all Elite+'s are the new type where you can replace without impacting calibration, however don't trust me for sure!
Only problem with my SL+ is having blown the torque tube requiring sending the hub to the US (from NZ) to have it serviced.
I had been using it with the Edge 500 and it was working rather well.
well this is a 2009 elite+ with a 12mm axle, they sell the replacement free hubs at cyclepowermeters.com and it does say for elite+ 2009.
I also found this online and on page 35 it says nothing about sending it back, makes it sound easy.
http://www.saris.com/pdfManuals/360.pdf
So I think they might be telling me rubbish, although the guy on the phone said the powermeter expert at the shop wasn't in.
I agree that for TTs it's handy for pacing during the race, but I found I would indeed look at my PT during road races and crits too. Either to warn me I was going too hard and would soon blow (on a hill for example) or that I wasn't going hard enough! Would not race without one now.