They sound like a real lottery. Some people making great power and can't complain (including me) and some just won't touch them...
since I've already bought it and running it, I ain't gonna go switching it out for a bosch. If I got a good one that's up to the task of 300rwkw on e85 then I'm stoked. But I'll always be keeping a very close eye on my wideband when giving it a hard time...