I have Emu's Virtuoso 2000, and if they are only charging $69.00, (I paid over a grand for it!!!) you might as well buy it - what the heck right? It doesn't even come close to the quality of the libraries that are mentioned in this forum, but you might find some of the patches useful as they can be modified to a degree. I bought mine as soon as it was released years ago, and at the time, it was great. I've put my Virtuoso in a box in the garage - I don't find it useful anymore. Is it just me, or am I contradicting myself???
I believe that they require E-mu hardware. Under the requirements for each of those soundsets, it says EmulatorX or ProteusX. Both of those products come with their own audio hardware. I do not believe that these are strictly software instruments but I may be wrong. If you don't own EmulatorX or ProteusX, you should verify this before buying.
That being said, I remember trying out a Virtuoso when it was initially released. I did not find much useful at all. If you have heard it and think that you'll use even one or two patches from it, then $69 is not that bad a deal. I personally wouldn't get it myself.
Don't do it. It's horrible. I bought it in 2000, sold it one month later, felt cheated by the hype, went for Gigasampler and AO: night and day. (I much preferred the sounds on my old Roland JV2020 and orch expansion card to the Virtuoso).
You wont use the sounds. Save yourself some trouble and tear up $69, -much easier.