We just bought 10 r620's and put in our 5596's to wire them up to. I like how the nexus's work and honestly I love some of the new quirks in the nexus OS. Config sync is great too for my vPC's. The 620's ship by default with a 10g Base T card in it I believe, we had to have them ship us some different cards so we could do twinax

Packetpushers.net just did a show on the Nexus line. Its sort of a grueling rundown of the features, cards, form factors, etc.

http://packetpushers.net/show-106-cisco-nexus-buyers-guide-deep-dive-series-kickoff/

They sure are smashing the Data Centre realm.

I enjoyed it though, having to deal with nexus these days.

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- Pete