powerflex black wishbone bushes

[Raceface_13]

cant decide if I should get new OE arms or get some black powerflex bushes, iv been doing abit of online digging and a lot of pre 2012 posts are saying the powerflex bushes are utter rubbish, seems post 2012 they revised the design from the purple to the black one that don't need tack welding in, is it worth changing them on a fast road/track car or will new OE be adequate?
anyone had any problems with theirs? ideally want a fit and forget situation :smile:

 

[105e]

I accidentally bought some black series ( the photo on the advert showed purple) I decided to fit to wishbones and sell on. Seemed a nice bit of kit, very stiff and I would imagine whats needed on a track car, not flexible rubber.