damavox,
I happened to stumble across this, and I wanted to caution you. "WindyCitySDR" is an ex-con named Martin O'Shield. He has spent a good part of the last couple years aggressively attacking Ettus Research, Range Networks, and the RTLSDR, OpenBTS and GNU Radio Communities, etc for unknown reasons.
He has been particularly aggressive toward Ettus employees for some reason; so I would certainly take anything he says about that company with a large grain of salt... for example, the post he listed above is from the OpenBTS mailing list; and was addressed by multiple Ettus employees and stemmed from the original author being confused about the frequency accuracy of the included oscillator. B2xx work just fine for OpenBTS provided you deal with the frequency offset (not hard). Just about the entire community is very pleased with Ettus products - the only real downside is the cost.
I don't know why he has chosen the software radio community to pollute, but we all wish he would go away! Nobody in the community takes him seriously but he does present a very poor image for us. Of course, it's up to you but I felt compelled to give you a heads up.
- GNU Radio Community Member