Things I liked: Very good rifle. I have no chrono but I estimate ROF to be around 800 rpm and velocity at about 350 fps. Got this gun during the promo period, at $120 this is a bargain. Deal maker here is the weaver rail integrated on top. Maybe not realistic but saves you $30 or more on rail clamp/attachments. MP5 rifles are very sexy, compact and reliable. Retractable stock doesn't wobble, high capacity magazine is a perfect fit. Lastly, safety/semi/full auto selector is VERY tight, just how I like it to be.
Things I would have changed: Please change the front and rear sights, not copies of the real assault rifle.
What others should know: It takes a while to master installing the battery, a stressful challenge the first time around but once you've done it 3-4 times it becomes routine. This is a very good gun. Dress it up with combo optics on the top rail and it becomes awesome!