I have been a long time supporter of pocketwizards. I used to buy the Plus units at $289 a piece locally before they were transceivers, and they were blue! Back then, there was nothing that could compete. The reliability and range was unbeatable.
But other options are getting better and better. I also use the skyport system and it also works very well, has good range, and is reliable.
Now I have added Radiopopper JrX studio with RP Cubes. I have to say that I really like them. Adjusting power from the camera is really nice. The build is nice, the foot is metal (unlike PW plastic feet of which I broke ANOTHER a couple weeks ago) But they're not perfect either.
The good:
-adjustable power! awesome!
-metal foot
-small form factor transmitter
-three dials that are very easy to use
-analog-ish control of digital flash power (i.e. adjustable in finer increments than 1/3)
-reliable triggering
-have not run into any range problems
The bad:
-no locking mechanism. It has fallen off my hotshoe a couple of times. Not as bad as skyport v1 though.
-though neither PW or RP is claimed to be water resistant, I've used PW in light rain zillions of times with no problems. I'd be very nervous of doing that with the RP JrX due to the top-exposed dip switches
-analog-ish control of digital flash power. Yes, this was also an advantage, but it's difficult to dial in a very specific power level that isn't full power. There are no 1/3, 1/2, or full stop "clicks" on the dials.
-the INTERFACE. Man, it sucks. DIP switches to change settings? To change channels? To change groups? For example, I have no fricken clue what I need to flip in order to change a receiver from group 2 to group 3. And I'm a former computer programmer that truly understands binary! I don't remember which DIP switches change the channel, and which don't. I don't know which switch to flip to disable a group. Basically, if I want to change anything on the RP, I need to look at a reference card (which they include, but seriously, I don't want to carry this card every time I shoot). The power button is also the test button. I would really like them to be separate. There is no labeling or legend whatsoever for the buttons/switches.
But I DO like them. In a situation like a wedding reception where I'm lighting up the ballroom, it is a great tool to be able to adjust power from camera position. It's awesome. But when I'm on a portrait shoot and I know that I need 1/4 power for a particular shot, that doesn't work. It takes more shooting and chimping, which not only wastes time and card space, but also wastes flash battery.
So I'm lukewarm about the RP JrX Studio + RPCube on portrait shoots and outdoor use, but quite stoked about it for indoor event shooting.
Pocketwizard has something similar now too... the AC3 zone controller. I have not used that yet. I'm not too impressed with the TT1/TT5 system.