I own a GSO 8" f/5. I bought it used in March or April. I enjoy using it. The mirrors in mine are fine, though I'm not what you'd call a critical observer. The vast majority of the time, I casually observe the moon, planets and sometimes double stars from my driveway. The GSO has been fine for that. I am also looking forward to using it in the week or so leading up to Jupiter's and Saturn's conjunction in December. That's really why I bought it: wider field for things like that.
The GSO two speed focuser is pretty good. I have Feather Touch and MoonLite focusers on my other scopes, but the GSO holds its own. The rear cell doesn't hold collimation that well, but it's entirely possible I lose collimation because I store my scope standing up on its rear cell.
It's pretty heavy for an 8" scope. I have added a third ring, though, for a Wilcox Ring set-up, since I use my scope on an equatorial mount. I need to put it on a scale, but I think it's quite a bit heavier than my 8" classical Cassegrain.
As you can see, I've done some work on my scope. It was a project during the early days of covid. I was bored.
You can't see it in these photos, but I also used Protostar flock board to darken the entire inside of the OTA. That's likely overkill, some people flock the area around the focuser (and sometimes only directly "behind" the secondary mirror) as well as a few inches in front of the primary mirror. There was so little difference in cost (with shipping), I just flocked the whole OTA.
Edited by macdonjh, 22 November 2020 - 10:09 AM.