I've been playing around with my Canon 7D's built in wireless flash trigger now since I bought the camera and flashgun (430EX II) at the start of this year. I've had some limited success with it, but I've found that it hasn't always triggered the flash (mainly as I've usually moved to far forward and so lost the line of site between the camera and the flash units). This has given me very inconsistent results.
I'd been looking at some of the many varieties of radio flash triggers which are on the market, of course there's the pro offerings from PocketWizard, but they come at a pro price! Most of the other devices I'd seen only sync to 1/250th at best and also don't offer 2nd curtain sync. I then stumbled across the King Wireless TTL Flash Trigger by Pixel, I've seen some of their other offerings on eBay in previous searches and I've also got a cable release for my 7D from them. (it works, the quality is OK, but the connector does have a habit of falling out).
I'd searched the net for reviews and info on the Pixel King, most of the reviews are based on beta versions of the kit, I've found a good review of the production version here -->
http://www.flickr.com/groups/strobist/discuss/72157627418629135/
I've ordered a set of 1 Tx and 2 Rx devices from ukhighland photgraphy; whose service so far has been very good. I'm hoping that they'll arrive in the next few days (before the weekend). I shall keep you posted!
