I've always considered DFI to be a little "half-baked"
My experience, however, has been confined to two separate LanParty Pro875 motherboards - one of the original and one the latest Pro875B version 2 boards.
Unlike Asus, which manufactures its own boards, the DFI Pro875's were a rebrand of some third-tier manufacturer's product. I can't produce the site right now, but there is a review out on the net of an i875 motherboard by a manufacturer I haven't heard of before or since, and the board is 100% identical to the Pro875, down to the power and reset switches on the PCB.
Both boards suffered from numerous hard drive issues - SATA ports, if left enabled, but unconnected to drives, would produce a 10+ second boot delay while the (lack of) hard drives was detected. Asus and Abit i875 boards skipped over unoccupied SATA ports in a flash.
The secondary PATA connectors, powered by Highpoint HPT372N were problematic - drives attached to those slots often produced paging errors in the Event Log. By contrast, two of my older Abit boards, a BD7-RAID and BD7-II RAID, have never given me problems with PATA drives.
So, in my book, DFI is still more about bling than about solid motherboard design. They are third-party-manufactured boards with issues that have been corrected by other manufacturers. I don't think it's appropriate to pimp out what originally was a value board for Asian markets as the choice for overclockers.
For the record, I've had a 1.6A @ 2.4 on Abit BD7-RAID, 1.6A @ 2.4 on Asus P4B266-C, 2.26 @ 2.66 (166mhz FSB) on an Abit BG7, a 1.6a @ 2.56 (160mhz FSB, 60% overclock - personal record) on Abit BD7-II RAID, and I currently have a 2.8c @ 3.72ghz (266mhz FSB) on an Asus P4C800-E, interspersed with a few SocketA rigs featuring Epox and Leadtek motherboards. Previously, I achieved the same overclock on an Abit IC7, prior to selling the motherboard.