
The Effect
Whatever you can come up with - it's a deck of cards!
Cost
£10 + postage and packing
I got my deck from World Magic Shop but it is also available from The Card Collection/Cards 4 Magic. At the time of writing, I don't think other dealers are stocking this deck yet.
Difficulty
(1=easy to do, 2=No sleights, but not so easy, 3=Some sleights used, 4=Advanced sleights used, 5=Suitable for experienced magicians only)
1-5
Difficulty depends on what you intend to do with them!
Review
Yes, £10 is a lot of money for a deck of cards but I could not resist for long after seeing it on World Magic Shop! I have no idea how much it costs USPCC to produce these cards, but I imagine it can't be cheap.
The rainbow deck consists of 56 cards, broken down as follows:
52 cards with standard Bicycle faces
3 double-backed cards
1 gaffed Joker

All four gaffed cards are blue-backed Bicycle rider design on the reverse, and the gaffed Joker features a five of clubs revelation.
The cards appear to be of standard Bicycle stock and handle well, as you would expect. The back designs are varied and colourful; some I am familiar with, some I vaguely recall seeing somewhere and a few I have never seen before. There are fifteen back designs, each of which consists of between 2-8 colours. The most numerous of these is the Bicycle rider back, of which you get ten cards.

The rainbow deck was supposed to come with a free trick to get you started, but I did not receive this. I have sent a message to Gochos so hopefully he will respond. In any case, there is a book available by Randy Wakeman that I intend on purchasing and reviewing; click here for details.
Overall
A very nice deck that should get those creative juices flowing; I expect Randy Wakeman's book will come in handy if you get stuck for ideas. It may be worth noting that the raindow deck is actually made up of 50 unique backs and not 52 as you might expect, because there are three Bicycle rider backs in blue. (I'm surprised they didn't include an orange backed rider back).
Score: 9/10