It it safe to update to the latest TOS 5?

[SquarePeg]

I have a F5-221 with TOS 4.2.40 with my discs in a RAID5 formatted as EXT4. I am considering moving to TOS5 with the discs formatted as BTRFS with the new TRAID feature.
I basically want to know what is the best way to do it. Should I do a fresh install to the latest version and wipe the discs (I have already backed everything up) or should I install an older version and update to the new one?
I have seen the previous issue above but that was in March so I am hoping the issue has been fixed although I have previously had huge problems.