I have the Bielmeier, it is first-class and will no doubt last longer than I do unless I get tempted by something more high tech :)
The only downside for me is that it only JUST fits in my fermentation fridge, it's quite wide. That and the fact that it shares the other "problem" of SS fermentation vessels - you can't see what's going on during the ferment. Still, I've made 10 brews in it with zero problems.
Geoff