My Trracer had that sight mounted on it when I bought the gun.
I've been playing for a long time, but I've never learned to aim a gun instinctively so when shooting a pump I've got to have some kind of sight.
Normally when I play I use an Armson OEG sight on a VSC Phantom.
This BT sight was decent. It's either a clone of the comperable NC Star sights you see on Amazon or eBay or made under license from the same factory.
I liked how it was elevated a bit, so that the sight picture was above the feed block, which gets in the way on some sights.
The reticle wasn't as bright or sharp as I wanted it to be, and after it took a direct paintball hit it seemed to get a little worse. I ended up trying to take the sight apart to clean it and broke one of the tiny wires from the battery. My fault, not the sight's- these things are actually quite durable and well built, but are not
designed to be user-rebuildable. There was no real way to fix the sight at this point so I ended up having to throw it away, though I kept the mounting rails for some other projects.
After that I put a BSA Huntsman red/green/blue sight on it. I liked this one better, mostly because of how aggressive it looked, but it also had a brighter, clearer dot. This one sits lower on the gun than the BT sights, so some of the feedblock crept into the sight picture, but not a terrible amount. I have yet to take a direct hit to this sight, so I have no idea how durable it is.
Oh, one more thing- don't go out of your way to get a green or blue dot.
They're never as bright red dots and don't contrast with foliage as well- on both these sights I always ended up switching to the "red" mode when I played.
BT red/green sight:
BSA 30mm Huntsman sight: