I would not put Colt in special company, personally. They have been running more on their reputation for some time.SOLGW does just assemble parts from elsewhere. Some of their parts are also built to their spec by third parties (handguards, barrels, etc). The value prop with SOLGW is they pay extreme attention to detail. They'll also go out of their way to fix any mistake. All of those little things actually matter for a hard use gun. Things like ensuring proper staking on gas key screws, barrel dimples for gas blocks + set screws with some type of threadlocker, etc.
I wouldn't think of them in the realm of a high-end company like KAC. Some of their components (barrels, for example) are actually pretty basic and inexpensive. They're just good enough for the job and, more importantly, consistent in spec and QC. They do also have a few higher-end components that are quite nice, like their M76 and M89 handguards, which are produced for them by Zev (to their custom specs).
As a result of all this as well as their excellent guarantees, some people kind of obsess over them a bit much. That's created sort of a mythical or over-hyped impression of them that seems off-putting to some others. This is just customers fan-girling on social and being ridiculous. They build solid products, so I'd buy with confidence and wouldn't be concerned about whatever questionable vibe customers' social posts might give off.
They're about in the realm of Colt, Daniel Defense, BCM, and FN. Although those companies may have certain parts which are a bit nicer in metallurgy (CHF barrels, certain Colt springs, etc), they're still decent.