well, i brought a pro pot, a yellow reissue fasel, and a 3pdt switch last week and they arrived in time for the weekend.
just whacked all this stuff in my wah, and it does sound far better. the fasel makes it sound a little more raunchy i'm sure, and the pro pot has a much nicer taper - its easy to find a nice sweet spot.
i don't know how it compared to a real vintage wah, but it would be interesting to compare.