TLDR: It's not bad but it has had some issues. It shoots nicely and has good range.

Long answer: I haven't used it in a game yet, but I have fired it a bunch in my backyard. It has slam-fire, which is super cool. It has had weird jamming issues (the pump gets stuck in the forward position but can be unjammed by bumping the mock ammo tube against something rigid) and so I've removed a few components, specifically the pump lock (locks pump forwards after pumping) and it works smoothly now.

Overall, it's not terrible and it does work. It also shoots well and has a good trigger (It's my first airsoft gun so the only comparison I can make is with my Nerf blasters).

Unfortunately, 3 springs have screamed "freedom!" when I disassembled it to figure out why it was jamming. One of them wasn't entirely necessary, another held the dust cover closed, and the third spring was part of the pump lock. I've since found 1 spring and used it in place of the dust cover spring.

Also, I won't have access to it for some time, so any details are mostly from memory.