I had to rotate the nozzle near the neckline to make sure it didn’t hit my neck, because that would bother me. Once it was rotated properly I never noticed it was there. I was a bit mindful when detaching to kind of pull it ‘down’ and off, since that’s how the clip attaches to the collar.
I have two 2L USWE bladders and a different brand (can’t recall off hand) 3L bladder. My first ride when I bought the gravel suit was with the 3L. My biggest gripe with that the nozzle on my ‘other’ brand doesn’t allow the liquid to come out very fast. This weekend was my first time using the USWE bladder/nozzle and I loved how fast it came out (which is adjustable). I put 1000 calories in my 2L bladder and planned to finish that & 2 gels by the 3 hour mark. I ended up emptying the bladder by about 2:15. I may see if the USWE works on my 3L bladder, or otherwise maybe purchase another USWE bladder.
Another item I noticed is that when I used my 3L bladder the first time with the suit, the weight of the bladder really seemed to pull down on the suit quite a bit, to a point it was a bit annoying how it would seemingly pull the collar up at the front. The 2L bladder seemed to do this only about 25% as much with the 3L bladder. This may take a bit more experimenting if I were to go with a 3L.