I have a PS with the US 85/15s. I find them to be great pickups, and perfect for the CU24. Each of my PRSes has different pickups, and they tend to fit the guitars I have very well.
It's nice to have a little variety. I haven't changed the volume pot, since I find no need to do so. But I use the tone and volume controls on my guitars quite a bit, and appreciate how I can get a boatload of different tones just with the guitar's controls.
Some of this might be personal philosophy/preference, but the more tones I can sculpt as I play, the happier I am. I'm not a guy who sets the guitar to 10 on all the controls and never touches them, or leaves an amp set only one way. Seems limiting to me if I want to emphasize certain parts or emotions in a tune.
The US 85/15s are very clear-sounding, and I think they have a beautiful high frequency response. I haven't tried the offshore version of the pickups. I'm told they're different.
Pickups perhaps shouldn't be judged in isolation; the context of a given rig changes everything.
An upper-midrange or high frequency presence peak in a pickup drives an amp a little differently. The tubes are driven harder in the high frequencies, and it creates a little more upper harmonic content that changes the character of the amp (and how it breaks up) in a good way, hence the popularity of treble boosters for decades.
When I want a little less of that, I turn the guitar's knobs to get what I want.
Every guitar is probably a little different, so a lot might depend on one's guitar, but also how one sets up an amp, frame of reference, etc. I tend to set my amps up a little differently for each guitar. It's just a matter of turning one or two knobs a little bit and finding the sweet spot for that guitar.
And I'm not afraid to use a good EQ pedal when I want a little something different, for example, if I want one of my Mesa amps to sound a little more Fender-ish (scooped in the mids more with a little more high frequency content), etc. We're all different and I know that there are a lot of players who don't want to touch a single knob when they're playing or working with an amp, and that's fine, too. Just expressing my own experience here.
I think this video is a pretty interesting dissertation on using the guitar's controls to create a sound, from Joe Bonamassa: