It is: A VST plugin which sounds like the legendary Eventide Harmonizer H910, which 'fucks with the fabric of time'. It's a pitch-shifter and delay, which does subtle double-tracking or massive stereo warping bwoyoyoing effects
You've heard it: On almost every record made between '80 and '88. Prince loved his Harmonizer. All those sped up/slowed down vocals and spacey drums. Most of the 'Purple Rain' album seems to have been through one. Tony Visconti used the second one in Europe on Bowie's 'Low', and Bowie used it most obviously on 'Fame'.
Is it any good? It's really fun. Playing with it, I kept stumbling across sounds from records. It's very good at mad feedback: I made this [500k mp3] in twenty minutes with Live 4, a Prince loop and some dodgy ragga samples (and Metal Mickey on the vocals). The Discord has a great, gritty, old-school digital sound and really simple controls. It can do subtle, but I can't.
Is it worth $39? Yes. The other way you can get this sound is with the official Eventide Clockworks bundle, which is Pro Tools only and costs £569.