I'd say yes. for practical magic and all around flourishing they look pretty kick ass. i can never understand this whole "oh my god, its a black deck of cards, wtf it must be dodgy!"
Let them shuffle it. yes, let the spectators shuffle your deck of cards. i know, its like they're taking away your baby, but in reality, and they're going to realise this as they mess around with it (with obvious lack of dexterity, unless your spectator is some sort of croupier. but that's another story) they're going to realise that the deck is normal, and that they're just black for a reason.
Here's taking it a step further:
If you wanted to trick them using a 'Trick' deck of cards, why would it be all black? wouldnt it just arouse more suspicion? That's laymen thinking. It would be more wise to get a gaff deck, make it as 'Normal' as possible (whatever normal is. i'd imagine normal indecices, standard poker size, etc.) Kind of like the invisible deck.
Anyways, im straying off point: Get the deck if you have the cash, They flourish well, and last very long. As aforementioned, the edges do get whiter, but they dont really affect the look that much as a deck. because the backs are faded in, and the colours are red/grey, they dont really make it ugly or anything.
ive owned them for ages now, and im quite happy with them. (cept for the price) There's a cool 3 of diamonds reveal on the joker, and a 3 of spades bar reveal. go nuts.
They're not the 'best' deck so to speak (frankly i dont even know if there IS one.) but they're good. Dont get discouraged if someone says that they're crap and start suggesting other decks because they're all black. Weigh out the pros and cons. Ive used this deck for magic a lot of times now. The only 'Dodgy' comment i got from them was:
Spectator: ... They're Devil cards. i dont like them. *runs off*