Seriously, there must have been more 'bird engine failures in BECs than all other popular engines put together. It always fails in the same place, the 3rd big-end or main bearing ISTR, and has even failed when dry sumped.
If I was building a BEC now I would go for an R1 engine which gives similar power to a 'bird but in a lighter package and thus far proved reliable in a BEC. Failing that, the blade is a great engine, light, very strong and lots of em around, and plenty powerful enough for a BEC.
Chris