hi there!
Just thought I might add something in, I promise I'll be brief since probably most has already been said!
I purchased Card College (volumes 1 - 5) a couple of months ago and been learning on it since!
In my belief, there is anything you could possibly need for sleight-of-hand card magic, although you're probably never going to use more than half of the moves or tricks explained in there.
So, if that's the case, what is the strength of it?
At first, you would sat that volumes 1 and 2 are the most important ones, full of basic and very important moves you need to learn to have at your disposal (plus volume 2 contains some pages on theory, behaviour and psychology that look just like PURE GOLD to me!). Actually you could spend quite some time just on those two. Volumes 3, 4 and 5 I believe need to be seen from a somewhat different perspective, that is like an encyclopedia, in the real sense of the term.
Let me explain: unless you are a well-experienced professional (and I by all means am NOT!

), you wouldn't need to learn all those moves, however, if you are just a little more experienced and you would like to create your own routine, or you have an idea in mind that might work but you lack the tools (the sleights) to make it happen, or even if you don't like a part of a trick in your repertoire and would like to make it better, well that's when those volumes become extremely useful!
Volume 5 deals with professional, well taught routines that take some time to learn (at least with me!) but are of great effect! The effects in there are many and of very different nature, so there's a little for everyone, also very nice if you're into exploring something different than what is usual for you!
Last but not least, for every sleight or trick there are some notes on the behaviour you should keep, the presentation or the presentations that might suit the trick or the problems that you might encounter, along with a way to solve them!
My rating: 9,5 / 10 - I reserve to myself the use of the left.over 0,5 in case anything greater should appear and I would vote on it!
Edoardo