Reliability

[ba-xr8]

hey everyone, i hope i can manage to keep this thread open as my ford/holden thread got closed.

i read alot on here and see alot of opinions. it seems that the Boss260 engine really isnt very popular amunst forum members. is there a particular reason for this? i am only asking as i am not overly technically minded.
am i right in thinking that a $1500 ecu update can put 240rwkw? is that correct? that seems almost too good to be true. is it possible to get that kind of figure from the Boss without TOO much money being involved?

Im looking at 2nd hand BA XR6 Turbo's and XR8's at the moment. Im a fan of V8's and love the bulge, but i am really looking for some cheap performance as bad as that sounds. are the xr6t really THAT much better than xr8's?
also ive been looking into turbo cars before in the past (300zx, skyline etc.) are the xr6t a "reliable" car? like ive heard some horror stories about the 300zx and repair costs.

ive tried searches and have looked alot of places on this forum but cant find too much info on this matter.
thanks in advance