I've owned the Sole F80 for 2 years now, and the only issue I've had with it is that the cushions at the front have worn out. No problem, this is covered by warranty!
I recently spoke with a dealer and he said to avoid the 2011 models, it looks like they're sourcing their parts somewhere else as the units are not stable and prone to breaking. 2009-2010 models are the ones to buy.
Treadmilltips.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com