I agree, the finish on E's decks can be great and sometimes the thicker cards can also be better, but it really depends on what you are going to be using them for.
Ever since I have become more fancy and started to get into the cardistry side of things, I have realized that E's decks are not what you should be getting if you are doing flourishes BUT they are great for magic when it comes to looks, I love my Ghost and Shadow Masters decks.
There is always a possibility of me being wrong, but these are the facts that I've seen:
The thickness of the cards makes things more difficult because your fingers have to hold more, the ease at which the cards slide also make certain flourishes much much harder. On the other hand, non-E cards don't slide as much and are much thinner, hence things are easier. Don't believe me? Take a regular deck of cards and do a difficult flourish with it, now remove maybe 10 cards, then attempt the same flourish. Its a little easier with less cards isn't it?
Now, to experiment on whether for flourishing you want more or less sliding, take a regular deck and a deck with fanning powder on it (which will slide less). Try the same flourish with both and I think you'll find that the fanning powdered deck is easier, meaning you don't want more sliding.
Now before some of you start throwing out random attacks about "not being skilled" or being a "n00b," please think of a valid, sound argument. Calling somebody random and then attacking them like that just doesn't make you look very smart, just very hypocritical. Something you shouldn't be doing to a fellow magician, I think you need to review the objectives of theory11 again. I don't believe "Become elite and laugh at all the n00bs and unskilled people below you while calling them random," was anywhere in there.
And if you were being completely serious about the 550 decks of cards, that doesn't make you sound smart, I'm not calling you dumb, just saying it makes you not sound smart. Sorry, you asked for it. If those are all E decks, thats at least $2940.
-Cyrus