I just built three systems for some family/friends, two used the Biiostar M7NCG (the IGP board in question), and one with the M7NCG Pro (same board + fireware and other goodies).
If I had two words to describe these boards, it would be rock-solid. One even saved the life of a 2100+ CPU when I installed the heatsink incorrectly (doh!). For the price, they can't be beat.
Overclocking options are typical of all other Nfforce2 boards whos BIOS is based on Nvidia's reference design. This includes Vcore up to 2.150V (crazy high), VDimm to 2.9V (higher than most), VDD to 1.8V (chipset voltage). The latter is something you don't find very often on budget boards like this.
Due to the fact I wasn't building these systems for myself, they weren't overclocked high. I merely raised the FSB to 166 (up from the default 133) on a 2100+ CPU to make it a 2700+. The vcore on all three were increased to 1.75, which worked flawlessly on these boards.
I would definately recommend them to anybody looking for a solid motherboard at a nice price, even for overclocking purposes. As far as I know, they don't use the Ultra400 chipset, so if you are looking for FSB > 200mhz, you should consider a different board. One other thing that was a disappointment: The multiplier range available, depends on the CPU. If your CPU has a default multiplier of 13 or below, you will only be able to use 5-13X multis. Likewise if you have a CPU with a multi of 13 and above, you will only be able to use 13-22X multis. <-- This was typical of both boards.