I have had a Sole F63 for about ten months now.
It is the smaller one but it works just fine for me and my long stride. I needed to get one that had a smaller amp draw so I could run my AC in my fitness room at the same time. The F80 and F83 are nicer but I do not think it would have worked with my AC and gadgets.
I have had no issues at all. If you have a Ground Fault Circuit Interrupter on the circuit, a treadmill will probably trip it.
I got mine on sale for just under $700.
I run on it for an hour. It does get boring so I have all sorts of ways to keep me entertained. I have cable TV, a ROKU, DVD player, and my old PowerBook for DVDs I ripped. I also have AC and fans for the summer.