It's... alright for an AEG? and being able to switch between burst and full auto on the fly is quite a nice feature since some sites allow burst but not full auto. Unmodded this was firing 345-350 on .2's and getting some pretty decent range once the hop was broken in.
Biggest complaints with it honestly? The upper and lower receiver aren't amazingly well fitted, so you get body wobble unless you add in some spacer to hold them in place.
There's basically no battery space. it's just a thin tube along the top of the stock that also has the battery wire and fuse in as well.. so you're stuck to using short, thin batteries with it. Rest of the stocks solid plastic.
Even greased and checked; you get a metallic smell from the gearbox after shooting for a while. Think the gears don't mesh amazingly well as even after only a little use they had some wear. Possibly because the upper and lower don't mesh properly/wobble and it's a open style split gearbox.
It's not worth the £350ish price tag it has though by any means. There's better AEG's in the M4 look for less out there.
I had a P90 for a while but honestly didn't enjoy the feel of it, or the top down magazine style of the gun. I only picked up the CQR on a whim last year after wanting a M4 but not the usual generic guff you see about.
In hindsight, honestly wish I'd gone with a normal M16A2 or the like, or M4 Socom. CQR isn't bad but it's not worth what it cost by any means.