The Rider-Waite deck, one of the most popular Tarot decks, was designed by a member of the Golden Dawn, but watered down to avoid giving away that Order's symbolism. Crowley was another member of the Golden Dawn, and at one time favored to succeed its founder, and when he founded his own magickal order he put his whole heart and arte into designing this deck. No tricks, nothing held back.
The Book of Thoth, Crowley's commentary on his deck, is awfully dense for a beginner or for someone just interested in Tarot and not the occult underpinnings. On the other hand, the little cheat sheet booklet that comes with the deck is pretty good, and probably all you need to start doing readings.
As for doing readings, treat the deck in the same way you would treat a friend - with respect, casually when appropriate, never carelessly, always with great personality.
Owned at least 20 decks before, and always return to this one.
In addition to the glowing reviews you're already seeing on this particular deck, there's a little bit more to add....and I do so without paying attention to any of the nutty 'warnings' related reviews or 'not for the weak at heart' rubbish.
Decks are largely a matter of taste...some will tickle yours, and some will not. Over time, decks which you thought were amazing looking will start to seem trite and juvenile. What I'm not going to worry about here is the taste aspect. That's for you to decide and will depend largely on your influences.
What can be said for certain is that there's a lot of interesting symbology on the Crowley-Thoth deck. Unlike my other standard favourite (the Rider-Waite), the symbology and correspondence references are immediately obvious, even to those new to that aspect of the readings.
Having one deck of each of the sizes for this set, I'd reccomend the 3 1/4" x 5 1/2" (large/oversized) deck for those meditating on or studying the artwork of the set. It makes the various archetype symbologies far easier to discern...particularly if your eyes are getting old like mine...:)
Visually appealing, easy to engage, and as deep as you're willing to go with them, this deck provides a wealth of reading inspiration, and has many great books available for deeper interpretation of the various influential correspondences referenced by it.
Definitely a great staple deck for personal or group reading.