I've been using my Vampire 500 in a 2000 for several months now and have to say I am impressed with it. While it does lack a LOT of compatibiliety, it is fast in what it does. It nearly keeps up with my 75Mhz 060 in my 4000T. It doesnt touch my G5 MorphOS machine, but not much does.

As far as price, i think the $300 I paid for it was fair. I got 128MB of very fast RAM, an RTG card, fast CPU, good speed IDE and even a network adapter by putting in this SDNet thing into the SD card slot. If I were to add all that up and put it into my 2000 in stand alone card it would be a lot more.