The overall rating is 3.5/5. Most of the complaints are either a DOA model (won’t reach temperature) or the supposedly complicated controls. It seems the only legitimate complaint is difficulty entering sub-10min times.
The factory refurb process pretty much guarantees that whatever the weak component causing the DOA is now replaced and tested. I’ve had very good experiences with factory refurbs (but don’t touch third party refurb like those laptops that keep popping up here)