This is a great guide for choosing the wireless trigger that is right for you and your needs: http://www.flickr.com …/59315881@N08/5590340051/
As you can see, the Cowboy receivers aren't on there. When asked why the creator of this guide pointed out that the Cowboy Studios triggers were more in line with the V2s, not the newer and more improved flash triggers like the Cactus V4 and V5s and the RF-602 and 603s.
I think the biggest difference is the range. Cowboy studios range is 30m. The RF-602s range is 100m. That's more than 3x the range. If you plan to only shoot in a small studio with nothing blocking your way, the Cowboy Studio Triggers seems like they'll do the job just fine. But if you ever want to move outdoors, you'll need a little something more.
Let's give a little perspective to the issue of range. How frequently are you going to need to shoot pictures a football field away from your flash? Do you really need a 100m range when, realistically, your flashes will almost never be more than 10m away from you?
That being said, what essential functionality do the newer Cactuses have that the CBs don't? I even think that having 4 channels is unnecessary for a lot of entry-level usage, or for that matter any usage outside anywhere where there are multiple people using flash triggers or TONS of radio interference.


