Ron, I don't own one, so can't comment on results. However, I saw them on sale at the local Sears Outlet for far less than the ads you posted.... Should you decide you want one, I'd check there.
We have one but not the brand you mentioned. It's less then $100, all glass, and works great.
If you go to Amazon and search "convection oven" three or four of these little round ones will show up.
I would tell you the brand but the kitchen turn-key has it stored somewhere out of site.
But anyway these are hard to beat for a small footprint oven.
Roast chicken with gravy anyone?