I just want to know, does anyone have any experience with SRAM Apex Brakes?

How do they stop? Are they good? Can you give me a summary/review?

I have a SRAM Omnium/Truvativ GXP BB for my singlespeed, and am going to use the SRAM 500 SS brake levers with the SRAM APex brakeset (MAYBE). But before I buy, I wanted to know:

What sets these brakes apart from say your generic Tektros?

I asked this on SS/FG forum, but seeing that the brakeset is from a road groupset, id be better off asking the roadies.

Plus, its better to ask the question in two different forums to have a multiplicity of answers.

Additionally, anyone have any experience with the SRAM S27s wheelsets? Im looking for one of the rims by itself. Just by itself. I want to lace it to a track/ss hub.