Unbranded (rear) lights

Before LittleSB came along I was commuting by bike most of the time - through winter too - as well as evening & weekend riding. I had a policy of at least 2 working rear lights - preferably 3 on my commute bike - so purchased lights accordingly...
I had a mixture of Cateye, Smart R2 and Knog for the rear - and Cateye for the front... I've since lost a Cateye rear, a Smart R2 and one of the Knog blinders has died (although I've still got the unit incase I work out how to prise it apart!). My Cateye and Smart lights were AAA powered ... and now I'm after some that are USB rechargable - I think ... bear in mind I have 2 commuting bikes plus a road bike and my wife has a few too ... I'm concious that I don't want to be scrabbling around removing & refitting lights the whole time.
The other day (actually a couple of months ago) I saw an unbranded rear light in the style of the Lezyne Zecto - and have now found similar plus others on "the bay" for a fraction of the price.... which leaves me thinking why I need to spend >£20 per light when for c£5 I could get several similar and leave one on each bike.
Q is really - are Unbranded lights false economy? Perhaps I should just get a couple of Smart R2s (competitors hate me having one on my TT bike - they can see it from a long way off and never seem to get closer!
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I had a mixture of Cateye, Smart R2 and Knog for the rear - and Cateye for the front... I've since lost a Cateye rear, a Smart R2 and one of the Knog blinders has died (although I've still got the unit incase I work out how to prise it apart!). My Cateye and Smart lights were AAA powered ... and now I'm after some that are USB rechargable - I think ... bear in mind I have 2 commuting bikes plus a road bike and my wife has a few too ... I'm concious that I don't want to be scrabbling around removing & refitting lights the whole time.
The other day (actually a couple of months ago) I saw an unbranded rear light in the style of the Lezyne Zecto - and have now found similar plus others on "the bay" for a fraction of the price.... which leaves me thinking why I need to spend >£20 per light when for c£5 I could get several similar and leave one on each bike.
Q is really - are Unbranded lights false economy? Perhaps I should just get a couple of Smart R2s (competitors hate me having one on my TT bike - they can see it from a long way off and never seem to get closer!

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Not seen the Lezyne Looky Likeys but theres lots of lights that look like Smart lights around. I think the Planet X range has a couple.
As supplemental lights, http://www.planetx.co.uk/i/q/LIPHSOFL/p ... -led-light and the similar skull shaped ones are handy, well worth grabbing a handful if you are putting an order in anyway.
Edit: Nebula, not Comet!
2020 Voodoo Marasa
2017 Cube Attain GTC Pro Disc 2016
2016 Voodoo Wazoo
I purposely have 2 + working rear lights in the dark in case of failure - and so far it's been the expensive lights that seem to have failed - possibly because I've used and abused them more.
I've bought £25 rear lights before from the big brands and they've only lasted a few months or fallen off the brackets and I've been without any light until I get a new one.
If 2x£12.50 lights last half the time I figure I'm better off as long as I don't lose/break both at the same time because at least I'll always have 1 working light.
Road - Wilier Izoard Centaur/Cube Agree C62 Disc
Allround - Cotic Solaris