Has anyone purchased the proteus emu packs

 not to leave you waiting in silence: I can speak indirectly on the subject. I have bought several Dimension Pro sound libraries from Digital Sound Factory (Classic Keys, Vocal Expressions, Ultramodern Synths) and have found the quality uneven. In general, there are 10% great patches and 90% filler, but that is completely subjective. Since they bundle a lot of patches together, the price per useful patch metric is still decent. In the Proteus Emu case, 3,500 patches for 99 dolares is a pretty good bundle even if 90% is cruff. As far as the integration with Dim Pro (and I assume LE) it is flawless.

I'm going to suggest a slightly different perspective...
I purchased the DSP EPS/ASR package for both Dimension Pro and Kontakt. And I downloaded the Proteus demo packs.
I think the sounds themselves are spot on - I still have an EPS. ASR-10, and a Proteus 1 and Proteus 2 in my studio, so it was pretty simple to compare<G>!
I had hoped that these sound packs would allow me to sell both devices to (a) make some space, and (b) pay for more goodies.
I ended up not using them much.
Oddly enough, I think DSF has done too good a job porting these libraries to computer based sample players. Or, sampling technology and techniques have improved so much in the intervening years, and our expectations are higher.
Or both.
Make no mistake, the sounds you get from DSF are VERY accurate. In both cases (Ensoniq and Emu) I started to notice things about the sounds that I never noticed 20 years ago when using the hardware. In chatting with other folks it seems many are running into this.
If you really like these sounds you have a couple of choices:
1) For the Ensoniq sounds you can purchase the entire library from Syntaur and import the ones you want to use. I already had the CDs, so I do that sometimes.

2) Or you could buy a used EPS or ASR or Proteus<G>!
It really comes down to expectations, and applications.
If you expect your favorite sounds from either to sound better, well, that's not really going to happen. If you expect them to sound like they used to, well, it isn't quite that either, but it is darned close.
If you want to use these older libraries to create super-realistic mock-ups that's probably not going to happen either. Newer libraries (Cinesamples, LASS, etc) are just orders of magnitude better.
If I did not have the hardware I'd own all the DSF 'archives'. At the moment I am going to stick with the hardware.

The original proteus 2000 sported a massive 32MB PCM ROM... which was pretty generous compared to my beloved Alesis QS6.1's 16MB ROM... Anybody want a used QS6.1 in really good condition? Just kidding! I will never give up my QS6.1! NEVVVAAARRRR!!!!!!