FancyCache has been in beta for a while now, the major feature it's lacking that prevents it from being as effective as other caching methods like SRT is that it's a non-persistent cache, it gets deleted every reboot. So it can't do anything to accelerate bootup. It's much more configurable than ReadyBoost tho. Could be an interesting product if it ever gets out of beta and doesnt cost a fortune.
SuperCache doesnt recommend using itself on a boot volume and the $80 price is a deterrent, Id rather buy an SSD or look into a hardware solution for that price.