I'm considering switching out my older 580 EX II's with a set of new 600 EX-RT's. I was also considering Radio Poppers to get my 580's wireless TTL. I've seen the 600EX's for as low as 550$ on Evilbay.
Is they're a better or cheaper way to get TTL off-camera flash? I like the idea of not having to mess around with triggers but If its cheaper, Why not?