Yeah, I think it really depends on the setup - I previously ran delta cards on a via chipset with Athlon (can't remember which chipset) and had nothing but problems, then switched to a mobo with an AMD 751 chipset - now it's rock solid.
Let's put it this way: the ONLY time I've ever heard of anybody having problems with delta cards, it ended up being because of the VIA chipset. Mostly I think this affected older mobos with slower processors, but... the general trend seems to be that via chipsets are not highly recommended for audio work, and I stand by that part at least!