1 vote against if you do file sharing or LAN cuz the onboard gigabit network is pci, not pci-e. There's a performance hit. Then again, if you don't do either or you just surf the Web, download a few things here & there, the Pro board is ok. If you must get ABIT, get the IP35-E which has pci-e network.
As for the PCI LAN as you can see it's~735Mb/s(91MB/s) which is waay faster than domestic LAN & it's faster than a single HDD can provide/handle.
For most people it's a total non-event but if you regularly do large transfers over a gigabit network & you use RAID 0 then it may have an effect.