I have an elderly friend who shot TR in the ORA most of his life and he always longed for a Bushnell Spacemaster, because he cheaped out when they were new and bought the fixed 20x variant.
I bought both models used online in the $60 range and compared them to my 80 mm Vortex and found that for sharpness the Spacemaster was similar, but the 20x version was sharper.
I also compared them to a range of other spotting scopes and they held up well for resolution and sharpness, but the 20X variant is the sharper of the two.
If you shoot air rifle the 20X model also focusses well at 10 yards, but that is certainly too close for the Spacemaster.
As good as the Spacemaster is for the money, I would recommend the 20X version for those two reasons... sharper and closer focus.
Color with these two scopes is where they lack as newer coatings certainly make a difference there, but for the money, these old Bushnell scopes are a fantastic deal.
If you are interested in a new scope, I would recommend that you first buy one of these old scopes. You just might and probably will be happy enough with it that you wont feel the need to buy new.
These days I use a Kowa 554, which is fantastic, but I might not have bought it if I got the old 20X Bushnell first. Not that it can compare, but there's a $2500 difference in price.