Seems to be working fine for me now as well. It was not before, so it may have had some intermittent down periods. Maybe they had been doing site service or something.
As much as I like Samsung for televisions, storage devices and a variety of other things, I'm really not too big on them for monitors. I'm sure they have some good stuff, but they are also proud of it and the prices tend to reflect that, plus the majority of monitor reviews I've looked at for Samsung that are in the "everyman" price range tend to be poor or not favorable.
Personally, I don't like the ultrawides. Windows doesn't play that nicely with them, and I have found the few occasions I've worked on them I have much preferred simply working with two monitors rather than one ultrawide. That's just my preference though, and probably doesn't reflect any kind of general consensus necessarily.
And you are right. There are definitely some important concerns on the professional reviews for that CHG70. Chiefly, which happens to be one of my biggest pet peeves, is the fact that that unit has poor black depth and uniformity. That is a deal breaker for any monitor I am looking at. If it can't do black properly, I'm not even interested in it.
Plus it has poor viewing angles, and for an ultrawide, or for anybody who might tend to use the display communally with others sitting nearby, that might also be a let down but if you don't care about or need wide viewing angles and will only ever be concerned about how it looks right in front of the unit, then it may be ok for you. Can't get past the cloudy, poor black uniformity though.
Seems all the refresh rate and Freesync issues have been ironed out though with more recent Freesync drivers, so the Freesync 2 now apparently works correctly across the full Freesync range with no issues, according to the Rtings review, which is comprehensive.