I had a Dragon+ before my Soltek, it was running great and still run great. I did some BIOS update, but not too much. I did it with the one that include the new Promise BIOS, because I was running with RAID and one when I put my 8500DV in to be sure that I'd have no problem. But if your system is stable now, I wouldnt do it unless you need the new feature. those BIOS didnt improve speed. only compatibility with some hardware. So if one day you upgrade to newer CPU, drive, ... then you could do it at this time. You can go to Soyo website (www.soyousa.com) to check what new BIOS may give you and decide too, that your choice.
-Always put the blame on you first, then on the hardware !!!