Well i did a little bit more digging on google and here's some benchies.
http://www.canadacomputes.com/v3/story/1,1017,7020,00.html
and
http://www.katuhintavertailu.com/testit/Via/C3/Via_C3c.htm
as expected, it gets slaughtered in just about everything. The 750mhz C3 ties Celery600mhs in some benchmarks but get whupped in about half of them.
Apparently Via was going to introduce 833mhz variation with 0.13micron technology but i haven't seen any place that sells it.
Edit: More info. Ok according to Via.com, 800mhz 0.13micron C3 has been release. But I can't find a single benchie, review, or reseller for it. According to a PCMAG article, a 833mhz C3 is suppose to use 7.9watts under full load and 162 milliwatt when idle. :Q If only T-birds would run this cool.
Edit#2: Finally found a review for the 0.13 Micron C3s.
http://www.ccw.com.cn/htm/produ/center/new/01_7_23_2.asp
The article's in chinese so here's a rough translation of the article regarding the performance of the C3. "800mhz/133fsb loses nearly every single benchmark to 700mhz/66fsb Celeron. Tualatin of the same frequency is twice as fast as teh C3"
So to sum all of this reading up. THE C3 is TERRIBLE for regular desktop use. You'll be better off buying a celeron600. It's only strong suit is it runs very very cool. So this is only suited for notebook use pretty much.