Hi, yes the 4011 has replaced the 3011 to the best of my knowledge although still available, these days I only use the 4011 for setups needing plenty of HP, otherwise its just Hex/S.
The price of the 4011 compared to the 3011 and the 10G SFP just makes the 4011 a no brainer.
I believe the UI means it includes the User Interface (small LCD with status and stats) this seems to be no longer a much available feature, as for GS, goodness know, "Go faster Stripes" purhaps :)
Cyril


