First, the real value of a PCP pistol for me is affordable practice, but there are downsides. PCP pistols have loopy trajectories, so the sights must have a large elevation adjust ability and because of that they can be only set for relatively short distances as accurate hold over with iron sights is not possible. I bought a PP700SA exactly for this purpose because I love the weight and balance. They are also extremely accurate. You can have confidence that a miss is your fault alone, not the gun's.
My initial impression is that the factory iron sights are totally useless. There is no elevation adjustment at all. So I went out and ordered an adjustable rear sight and milled the dovetail on the gun to match. That wasn't good enough because now the front blade was too low, so I had to make a new one. That too didn't work well either because now the rear sight interfered with the rotating loading door. In the end after all my faffing around, I decided that open sights don't work worth a damn on an air pistol. I then went out and bought Red Dot sights, Reflex sights, See-all sights and a laser sight. Then tried them all. Remember, my primary usage is practice first and pesting secondarily. I found the reflex sight the most useful for practice and ranges beyond 15 yards because the sight does not block the target when holding over at longer ranges and it fully meets my practice criteria. I usually shoot between 20 and 50 rounds a day, every day at 25 yards.. The only downside to the reflex sight is that the sight line is about 1 5/8" above the barrel line, which means I have to hold over my target at short ranges and depending on the actual distance involved, changes between 1 5/8" and "0". I solved that issue by installed an inexpensive laser ($5) to the longitudinal dovetail on the barrel shroud. The laser is very small and is mounted very close to the barrel line. (.400"). It is adjusted parallel to the barrel. Now the holdover is easily seen at all ranges for pesting.
I am very impressed with the PP700SA. It is accurate and cheap at around $250. feels really good. It has a nice trigger and excellent balance. It is Chinese, so it has terrible quality O rings, so be prepared to reseal the gun if you get one.