I have some experience with USO, in scopes and their spotter, or field scope. While it's nice to have a reticle in a spotter (but not necessary), their spotter has their proprietary Ergo parallax adjustment/ focus, which can be a bit "problematic". Similarly most of their rifle who's prior to 2010 or so had the same Ergo, but it's now been replaced with the TPAL system. You either hate it or deal with it.
Most USO's are rather specialized or custom built, so there may be other little quirks. I have found the quality to be excellent, and the technical support to be top notch. The glass is pretty good quality, likely equivalent to S&B and Premier and other top glass, but personal preference will rule. (As an example, I ran a first gen Razor, but the glass didn't like me eyes, or vica versa, but everyone is different...)
I currently have one USO, with a Horus reticle in it, and I have a love/hate relationship with it, as it pretty much demands a 40 minute rail, and is realistically built to spot your own shots/ corrections. USO took Horus's concept and shifted it 4 Mrad beyond the design. Normal zero ends up being very high in field of view, and that is just how the reticle is placed. Being FFP, it works great at lower magnification, but at 22x, it can be interesting. Conversations with the guys at USO, they were very clear it is pretty much a custom design. (I didn't design or order this one, I just ended up with it). I would buy another USO, likely with a Gen 2 reticle or something more conventional, but I would still run a 20 moa rail, as they do not seem to get all the elevation as the current Schmidts or Nightforces etc. The EREK system is a bit different, but okay when you get it figured out. It's sort of a customizable zero stop, so it may appeal more to technical shooters, such as might want to be able to go to more than a few Mrad down (only a few practical applications for this, I will leave it to y'all to guess

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If this was your only high end scope, I might recommend going to something a bit more mainstream.
Just $0.02 worth..