Are 4TB Bolts recommended?

I've been reading a lot of posts and it seems to suggest 4TB Bolts using Seagate drives (STDR4000100/ST4000LM016) are risky and unrealiable, especially depending on which firmware you get.

1) Are they still unreliable or are the ones shipping today have new enough firmware as to not be a problem? In other words, is the drive worth using or will be a headache I'll regret months/years from now?

2) Are there any other Bolt recommended drivers for 4TB or higher? I saw the 5TB BarraCuda...

Are 4TB Bolts recommended?

Are 4TB Bolts recommended?