I would not hesitate to buy a Rogue Product at all. If I was in the market for an amp I would jump on an ST100.
Why Are There So Many Used Rogue ST-100's Being Offered For Sale?
Seems like used listings pop up every week, including from resellers. This has been going on for a while. A "dark" version was just listed today. I was contemplating picking one up, but now I'm doubtful that I will. I had read that there were transformer hum issues. Are there other issues?