My Powerspec has worked without issue so far (knock on wood). Seriously, once you really take a look at it, there just aren't that many components and every one of them can be easily found and bought if needed.

The only thing I've yet to add, and will, is an active cooling fan for printing thin/wispy PLA (which IMHO is needed with any of these printers). It'll happen...

as to RepG, I used the older version of Makerbot, until I bit the bullet and bought S3D...