I actually just got the AT version of this motherboard last week (GA-586SG). Haven't done much with it yet other then just verify that it works. Seems like a nice board though, easy enough to adjust settings via the dip switches and the manual is available on Gigabyte's website (at least for the AT version, but I guess much of the same info applies looking at both of these boards).
Mostly everything on the GA-586SGX is laid out much nicer compared to the AT version... you don't have the problem I'll run into as I begin doing my next Socket 7 build with this board, with the CPU being located beside the PCI slots, meaning you are limited in the length of the cards you can use for most of the slots ... 🙁 . Plus you have the extra ISA slot!
EDIT: Oh, I haven't got around to trying a K6-2 with it, but I assume it should work once I update the BIOS as one of the last updates apparently added support for them.