ok, I think lots of stuff has been blown out of proportion.
I have the following and have sense late July.
SN25P
X2 4400+ OC'd to 2.6
2 Gigs Patriot Ram
2 x 300GB Maxtor maxline III HD
evga 7800GTX
BenQ 1640 DVDR
Anywho it is running without issue. The X2 did need a driver. That is done. The sata did need a bios patch, that is done (Y Bios). This is a good SFF. As good as any bar none. Plain and simple when I had my 3200+ winnie I did 2700 or 270x10 on it with no issues. The shuttle heatpipe may be the most ingenious heatsink I have used to include the XP90 or the Zalman 7000Cu. I did nothing special to get this to work. If you want to build a Micro ATX PC, then do it, but the shuttle is a good box. By the way I also have an X-QPack which is pretty good, not nearly as sturdy or nice as the shuttle, but decent in all respects. I believe with the release of micro atx motherboards, that are as good as the shuttle's Nforce 4 Ultra board, maybe the X-QPack will be a good option for those that upgrade every 6 months (me included).
Also why would you pay for a new bios chip? My shuttle is from July and I have not had any such issues switching from a Winnie 3200+ that did 2700 to an X2 4400+ now at 2.6
It can push the power for high end video cards, check my machine, but the current PSU does not have a 6-pin power connector. Since the release of the SN26P I anticipate this may have changed (they have the same chassis)
So if you follow the Thread posted by Pakman, you will see that the SN25P is quite capable and did I mention quiet? The shuttle is one of the quietest machines I have had. It is quieter than a stock QPack by quite a good margin. Since it has 2 specific air flow channels, it is very easy on the ears.