I do. They include some useful tools. There are also other packages from iDustrial Revolution (XEffects), Ripple, and Andy Mees. All available through FxFactory. Depends on what specific functions you want to use. Ripple also has some freebees on their own site. Plus a number of good ones at Alex4D.
I got it only for the White Balance adjustment. It works quite well, better than many other ones. You adjust the Kelvin offset, so it doesn't deal with other color casts. For those situations I use Hawakai Auto Grade which gives you a dropper.