I am the 2nd owner of my 80/600, but the first owner never use it, so basically it's new. The first time you saw through my 80/600 was at Lake Egret Observatory, with a TMB Aspheric Orthoscopic 25mm eyepiece, I guess this eyepiece may sell for US800+ at 2nd hand market. Then we did artificial star test at my old office at 3/f.
on a very clear Summer night last year, I pushed up to 270x with TMB Supermonocentric 4mm eyepiece + 1.8x ED Barlow, and the lunar image is still solid, even at this ridiculous high magnification. I won't use the term "never run out of power", but for premium APO refractor, the real power only show off above 2x per mm aperture. Well, just like your Italian sport car, only show off it's real character at over-speed.
The real value of a premium APO is, it give me a peace of mind, never interested in any 80mm refractor.....
My 203 f7 APO is not as well corrected as the f9 model, but it's very unique, you never find any APO made, no matter by Takahashi, Astrophysics, TEC.... being as short / portable as mine.
Is 203APO big? yes by typical amateur standard. But considering it's power, it's really as "small" as a Porsche.