Okay, looking just at the 2 x 8" CC versions...
$900 each. Not exactly cheap in my book, when a brand new GSO 8" F5 Newtonian is less than half that amount, but not excessive for what I consider a niche reflector. I paid about $500 for a used Vixen VMC200L / F10 Field Mak-Cass. I sold the VMC -- my vintage 1980s Meade 826 (8" F6 Newt) made it redundant -- but kept my antique Tinsley 6" F20 & vintage 1970s Edmund (3B) 4" F15 Casses. I've been a fan of the design for 40 years -- so much capability in a compact / relatively lightweight reflector.
But... based on the content of this thread, I wouldn't recommend these CCs to a novice / beginner -- there are better-performing, easier to maintain reflector options at 6" & 8" apertures. An experienced scope owner like myself... yeah, I'd be willing to try one, and improve as needed -- they're about 30% cheaper than a new VMC200L (and don't have that design's more complicated collimation requirements) -- if the mirrors are decent quality. Because, the hardware on these CCs isn't expensive, I would expect the optics to justify the largest portion of the cost. In that respect, rather like my $600 AT102ED, which is worth way more than I paid for it.
IMO, it would be fair to compare either of these CCs with a same-aperture mid-tier Newtonian for resolution, at least. As for build quality: Sounds like there are some issues, but nothing that I couldn't improve without harming the scope. I mean, some folks swap the stock focusers on their $$$$ Takahashi refractors, so I don't consider that a show-stopper at this price point.
(I've been holding back my tax refund on the off-chance a vintage / antique 10" Cass pops up. But... I may try one of these myself -- post a review of one.)