[Discuss-gnuradio] USRPs best/worst features

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Hi guys, I would like to have some opinons and techincal detail on USRP and 
USRP2.

What is, to your opinion, the best and the worst characteristics of the 
USRPSs? What I should expect buying the USRP2, as a difference from the USRP1?

What are they're main tecnichal detail (noise floor, decimation/interpolatuon 
avaibility, transmission filter designing...)?
And is there any other piece of 
hardware that can be used as the Hw RF frontend for gnuradio?

Thank you a lot 
for your answers

Of course links and opinions are more than welcome.