I have had the DFI LP DK X58-T3eH6 and the Asus P6T6 Revolution X58.
Both BIOSes are easy to use, not much in it TBH. Both overclocked well.
DFI screwed me over though and I sent the board back for refund (why I switched to the Asus) due to a compatibility issue I had while trying to load the board up with various PCI-Express cards....They were quite frank in telling me they had no intent to look into the issue.