I have a Chinese made - B21 made by Xisico or its predecesor It's a side-cocker similar to an RWS 48. Except, I think it's much improved over the RWS-48. It has a well designed trigger assembly. All of the parts of the trigger unit are machined solid steel. The trigger pulling force and pulling distance are adjustable by turning both screws on the bottom of the trigger unit. (RWS has a plastic trigger, it looks "cheap", but I believe it has some adjustablity), The B21 has a heavy barrel and an expandable heavy-duty side cocking lever. I've dissasembled it and it is a very nicely made sid-cocking springer.
The only complaint I have about it is that you MUST take it apart and clean out the metal shavings before you start to use it. This means that you need to make a clamp to dissasemble it. Not hard to do, but a PITA. If you don't clean it out, then your seals will deteriorate at a much higer rate.
My B21/22 (22 caliber) is now about 4 years old. It has functioned flawlessly and is quite accurate. I put a $75 Walmart scope (forgot actual band name) on it that works really well that mounted easily on the scope rail.
IMHO, the B21 is the best value in springer air rifles. I think I paid about $120 for it. To be fair, I have heard stories about how the iron sights didn't line up properly. Mine were fine - but the rear sight broke when I dropped the rifle on a hardwood floor. I could replace the sight for about $15, but now that I have a scope on it, I don't have any need for the sights that came with it.
And, for anyone who wants to blanketly put down "Chinese" air rifles, including the B21 - buy one......try one.....take it apart....and then come tell me how they are "cheap crap".
PS - if you want to see the B21 fully dissasembled, check this out:
http://www.xisicousa.com/files/B30_Diagram.pdf