In reply to C Witter:
I second everything C Witter has said. I originally bought green, yellow and grey evolutions about 7 years ago and whilst purely in terms of being placed and not walking they were great, the build quality let the evolutions down.
The grey and green have now over been replaced by revolutions (the grey got replaced 6 years ago and the green 2 years ago) and I've also bought the red and blue revolutions in the last couple of years.
I really like the revolutions, the build quality is good I think. I did buy a few of the dragonflies, though they're first bit of dmm kit I wasn't a fan of (felt like they had a smaller range in comparison and the stem felt overly flexible) and have since sold them.
I can't comment on the WC or BD offerings in comparison to the revolutions I'm afraid.