I'm using them right now (1.28), win2k also shows 1.25.1 as version (highpoint's lazyness keeps surpising me: they seem to have quit making drivers, and they can't update the damn version number :)).
Anyway, they are fast here, using the 1.25 bios. The 1.28 beta bios makes it damn slow (in combination with any driver). The 1.28 drivers are the only ones that work OK (sometimes) in win2k with my maxtor ata100 drive. Other drivers crash way more.