unless your minted, the R154 is the better option. the getrag is proven time and time again better for sure, but you can buy at least 5 R154's for 1 getrag, is it worth the cost if your not going to use the performance?
W58's take a good beating. some guys have trouble at 360bhp. parry had 427hp and his lasted since he dropped it in there. Jekyl ran his at 450+ levels for a little bit before it gave way and crumbled. They aren't naff boxes just not up to a beating AND most importantly guys, not all boxes are treated or looked after the same, which is strange because all R154's go for the same sort of price.