I'm seriously considering purchasing a used Sole F80 treadmill from a buddy. While it's had only light use, it's a 2009 model. It's in great condition (no known issues--has mostly been used for walking). I'm trying to figure out if $500 is still a fairly good deal for this. I know Sole F80's are a popular treadmill model and go for near $1,500 new, but I'm having trouble locating info on market value for 2009 models of this treadmill. Looking forward to any insight from the ST community. Thanks.