I have only had one out of my Six Dynamax 6" or 8" scopes that was not at least VG. That one was bought by a member here, that took it apart and when assembled properly ended up having diffraction limited optics.
I still have to have to believe a member that worked for them, that was there to see complaint or lack of them. I also believe any company that could put out scopes and last for 10-15 years doing it, HAD to have had a decent product.
Those that went into the field and were good stayed where they were, and still are, while the bad ones produced the final year of production have been bouncing from user to user gaining the reputation of All are bad. I tracked mine to at least FIVE previous owners.
I would bet each one of the scopes the person posted who tried 4 of them owned had a minimum of 5 or 6 previous owners. Reading stories from people that had reworked underperforming Dynamax telescopes the majority had severe assembly issues. In fact most of the Astigmatism issues were from the Primary mounted improperly. Also the Primary baffles were mis aligned, correctors and secondary mirrors were off centered, this prohibited collimation. It is easy to make comments like just fair, posting optical issues such as rough optics or zones is more helpful there were some with SA, those were mostly produced at the end and should have been rejected.
I have always preferred the mechanics and tripod of the Dynamax, also the resin tubes were more stable from thermal issues when they were at outside temp.
In other Astronomy sites I haven't seen nearly the percentage of negativity I have here. We all know this site is heavily sided toward one brand that is fine, but I sold my Celestron when my Criterion Schmidt out performed it, substantially.
BUT I wouldn't buy ANY Schmidt from 1970-1989, unless I could look through it, know the seller, or the seller describes the optics in a way that shows they know what they are talking about, and they are guaranteed good.
For everybody else keep an open mind and look through as many as you can.
I agree with the 4000, it seems about 1/4 of them were just plain awful! I happen to have one that is superb, BUT it took a few Dogs to find it!
I know the Dynamax on EBAY right now and it is superb! and if anybody wants to send ME a Dynamax, unlike some I'll gladly take it! It might be a fun project!