I have a solidoodle 3 at home and a makerbot replicator 2x at work. I used the SD daily for a couple of months, but then ran out of ideas. Just like every other tool, without a problem to solve, its not very useful. Ive done a few upgrades, like a glass bed, a new hotend, carriage bearings. Its a fun hobby, but thats it.

I don't see fdm printers ever becoming ubiqutous. Too much maintainance, too many moving parts. This will always be the domain of tinkerers.