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I can say that Sky Rover is a rebrand, they're identical to the similar Teleskop Service ones. Optics are from Japan and the rest is from Kunming. My first Sky Rover had a quite substantial 4" focuser but my current one has a 2.5" that works well. It has a 3 element corrector installed inside the focuser so it cannot be replaced by a feather touch or a FLI Atlas but I have found it works well enough. Not sure how well it would go with a heavy Proline but it is reported with a 55mm imaging circle and I have found the correction to be pretty damn good. It may not have the correction of a FSQ130 but it is also 20-25% of the price.
Even some of the offerings that look very similar are at times a bit different. Some are FPL-53, some FPL-51 (both Canon-Optron in Japan) and others are FCD-100 (Hoya Japan) which is very similar to FPL-53.
The optics in a lot of these rebrands are routinely pretty good, the lemon slips through every so often but that happens with every company so it isn't just the Chinese ones that have issues.
For astrophotography though, especially with the larger Proline sensors, their failing is correction over a large chip. Most of them these days only offer up to 42-44mm correction which is pretty standard BUT the kicker is that one companies 42mm correction is another 36mm correction depending on how picky they are on spot sizes at the edge of the field. Take some of the old Tak Epsilons from the film days, they had a 44mm imaging circle but had near 20 micron spot sizes at the edge of field, my Sky Rover has less than half that.
Suavi has a CFF105 F/6 and that is probably what you should be looking at. It uses a Feathertouch focuser and they build flatteners with the correction required for what you're looking at.
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