If you're a user a Djay, no doubt you've at least heard of Djay Remote.

I've been testing it for the last few days.

i'll borrow Ean's format;

the good
The cues, loops, eq, and fx are all excellent and respond with no noticable latency or lag. These all functioned perfectly.

the bad
the vinyl/deck/scratching is well..umm..not good. I got much better response using Iteleport as remote desktop with Djay.

the Conclusion
If you ain't gonna scratch, this app is great.
If you wann scratch, wait for the update.