Well it's up to the individual to choose for themselves.
Never had an 040 so I don't really know what the difference
in performance would be during actual usage.
Have gone from 030 to 060 in the past.
Wouldn't be without my 060 now. (Until there is a new PPC).
Wouldn't have the knackers to do it myself, but PG says he has done it many times before.