I fitted Deflex front and back on my 4x4 - no complaints at all for the price - IMO Powerflex are having a laugh, the finished result is no better at all, but if you got cash to burn then carry on!
If we're being picky, yes the Powerflex ones look a tad prettier in your hand, and they come in flashy packaging that you rip up and put in the bin - but once fitted (mine fitted fine) there's nothing to chose, they've been in 12 months and all OK.