WERA are excellent bits, I have them and rate them highly however I'm also very open to trying other challengers and when dewalt recently relieved me of some hard earned cash on upgraded tools they threw in lots of these extreme impact torsion bits in 50 and 25mm, I must say I found them easily as good as WERA, I've yet to shatter any and if I can get 6 months from one bit then their as good as WERA in my book as well as being cheaper, well worth a try