As far as I know all model years Viggen pistons are weak, but if you’re not going for more than 240-250whp then it shouldn’t be an issue. GL with your search.
99-02 saab 9-3 FAQ, good stuff:
http://thesaabsite.com/93/93faqs.htm
In the end though, if you want one and are aware of their pluses and minuses, then get one. They are a niche car, and you’ll find that people either like them or hate them. It is nice having something different though.