PerformanceThe Rosewill RK-9000 series keyboards are available with all the current switches from Cherry, which means you can get it with the following MX key mechanisms: Red, Blue, Black, Brown. The red version of the switch is good for gaming due to the fact that it is a linear switch unlike the blue and brown version. The red key mechamisms are very good for gaming but perhaps less than ideal for speed typing due to their lack tactile feedback near the actuation point. For typing most people tend to prefer the blue or brown mechanisms, but some still feel that the black switches provide an advantage due to their very high actuation force and linear feedback.
TypingThe general typing performance of the Rosewill RK-9000 keyboard is very good. The Cherry MX Red mechanical switches works well and its typing performance is way better than anything you can get with a membrane based keyboard. The MX Red switches have linear feedback with no hump around the actuation point which means that it takes a while to learn where to stop pressing the keys, unlike with the Cherry MX Browns where you get a tactile bump near the actuation point. The Reds have a similar actuation force as the Browns which make them very pleasant to type on. The resistance you feel on the Red keys is somewhat similar to that of membrane keyboards which makes a transition to mechanical keyboards very easy.
As a business keyboard this model has a lot of potential since the design is very clean and you can get it with all the different Cherry MX keys and it is priced very reasonably. It is not pretty by any means, but it is not horrible looking either.