I think its kind of hit or miss. I'm still not comofortable running it without a backup.
As a bit dump its not so bad tho, just make sure you check it before show time, I've had it reset to defaults on me before. I've also had it corrupt files on me on one occasion.
I guess out of all of my experiences tho, I've been more successful with it then not, but I still don't think its as reliable as my jb3 is.