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These are GSO dobs which are rated at 1/12th wave PV surface, which is 1/6th wave at the wavefront. Of course those figures actually tell you very little about the quality of the mirror. However, I have looked through a few dozen and own one myself. Optically they are quite good and some are excellent. But as Mark says sometimes they need some "fine tuning" to deliver the images they are capable of, which is often beyond an inexperienced observer. They are certainly not junk and better telescopes than what $2,000 would buy you 10 years ago and that was a dayyam lot of money back then. They have a very good cast aluminium mirror cell.
Cheers,
John B
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