I have a Chinese "copy" of an RWS 48 - B21/22 made by Xisco, or its predecessor. It shoots .22 pellets at 900+ fps. I have owned it for over 5 years now and use it quite a bit.
Pros:
1. precision machined 2-stage, all steel, adjustable trigger
2. long heavy barrel - exceptionally accurate.
3. integral scope rail
4. attractive hardwood stock
5. lever action
6. No plastic parts
7. quality internals and externals - very durable and nicely machined
8. Priced around $160 last I checked
Cons:
1. Barrel is a little too long, and some people don't like the extra weight - some folks have successfully cut down the barrel and claim no loss in accuracy or power.
2. Recommended to disassemble rifle before using and clean out metal dust and re-lube (yes, it's made in China - small price to pay for an exceptional rifle at that price)
3. Finish on Hardwood stock is not bad, not great either, but I'd prefer a hand-rubbed oil finish - maybe I'll refinish it some day.
This is the only Chinese made Airgun that I like. I personally think it is substantially better than the RWS 48, that's why I bought it - primarily for the trigger system which can be fully adjusted, polished, etc. Do your own research and don't listen to people about "Chinese Airguns" who don't actually own a B21 side-cocking springer. Believe me, unless they've actually disassembled a B21 and examined the parts, they don't know what they are talking about