This is a nice alternative if you're not ready to spend the cash on the PocketWizard line.

This unit is does its job flawlessly. After ten test shots, the unit fired the flash 10 of 10 times from 40ft. I haven't tried any distances farther than that yet. Out of the box there were a couple challenges. First, the PC cord has a submini phone jack at the other end. However, the receiver will only accept a miniphone jack. So buy a submini to miniphone adapter, to connect to speed lights, prior to purchase. Next the OEM battery was dead. I purchased one for that world famous electronic store we all know and love. So my expense was an additional [$]. The dials are very small but so are the transmitter and the receiver. There is no "ON" LED on the transmitter. The performance of the unit out weights the minor inconveniences by far.