Are these scopes of acceptable quality?
To be brutally honest, in my opinion, NO!
I've not really seen a spotting scope in that price range I'd stay with over the long haul. I own and use the B&L Elite 20-60x80mm scope. It is the absolute best and clearest I've ever looked thru bar none.
At the range I've looked thru a ton of them of many brands and for the most part I find a rifle scope to be superior to 90% of them I've looked thru for spotting bullet holes. That is definitely NOT the case with the one I now own.
Binoculars and spotting scopes are two places I just don't believe in trying to save money by buying cheap. I'd honestly rather have a low priced scope on my rifle than a cheap binocular or spotting scope.