must...resist...temptation...
I'll only comment on my personal experiences with VIA-chipset based boards. General stability wasn't a problem, but the annoying "little" things -- and a few major ones -- steered me clear in a hurry. The last straw was when I had to totally (practically) disable 686B on my 8K7A's to get decent performance. I've had USB headaches, AGP issues, PCI troubles, IRQ nightmares ... you name it. Maybe I've just been extremely unlucky?
IMHO, with a VIA chipset based board, it is luck of the draw. It might be stable, it might not. Depends on whether you configure the hardware correctly (avoid SoundBlaster products), avoid PCI RAID/SCSI controllers (latency nightmare), load the latest 4-in-1 pack, update to the latest VIA BIOS, and install a handful of third-party patches.
Go ahead and flame if you wish. I'm not gonna tone down the "rhetoric". Speaking only from personal experience with a wide variety of boards (including several of the latest KT266A flavors), I simply can't recommend them. YMMV.
BTW: Why don't you modify the title to "Who has issues with VIA-based systems?" ... You'll get a few more replies