SiS used to be horrible, and pretty much everything they made was suck. ( but that was on pourpose to be CHEAP which was more important )
When they caome out with the 735 chipset, it freaked everyone out, because it basicly rocked. It was the top of the pile for a little while, it even crushed boards 3 times the price.
The K7S5A is not perfect tho. I have had no problems, and I buy tons of them ( I have 4 in the house, running almost every OS and CPU ) Others have had mega problems.
I would give SiS as a company, at this moment an 8 out of 10. I would deffinately let others figure out if there newest boards are any good before I buy them tho...