I was just looking at that, was about to buy the rackmount wah since i couldn't find the older version to replace my broken one. I would have gotten one, but i already have an evh for those 80's sounds. As well, my mutron phaser has a much better sound than any phaser ive ever tried, easily,

"The new MXR Custom Shop Script Phase 90 brings back the headroom and clarity of the original, along with its ultra warm and smooth phasing and reduced midrange swell."

I suspect its the exact same circuitry as the script version, but they might have made some changes here and there. Probably does a better replication than the evh, anyhow.
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I think i'll still stick with buying an EHX small stone.

If you're a fan of harder phasing I'd go for one of the MXR phasers, the smallstone is very watery and lush, but not so great for more obvious phasing or use with distortion(I'm guessing musical style from your username here)