I have the Strato II Multi and I highly recommend it. Great button layout, build quality, and reliability. Plus it comes in a package with all the different cables you may need.
These are seriously amazing. They're cheap (compared to something like the PocketWizard PlusIII), but not so cheap that you can't trust their construction. The transmitter/receiver pair is ~$100 US, and individual receivers are ~$60. Here's an example E-bay store that I would trust (Cameta Camera)
, or you can order direct
and wait for them to ship from Hong Kong.
The groups are done in a fantastic way. Set each receiver to a group (A,B,C,D) and on the transmitter, you have four buttons that let you turn each group on or off independently. For my own shooting (assistant photog at weddings) I set up 3 flashes on lightstands, each one set to a separate group. Usually, I turn them all on for full cross-lighting, but I can very quickly turn any of them off if they get in the way.
And a HUGE PLUS is that the transmitter's TTL passthrough works even when it's off. My own pattern has become E-TTL on-camera, manual flash off-camera, so this is a very big feature that not even the PocketWizard Mini or Flex have (you cannot fire the on-camera flash with the remote turned off).
Regarding range, Phottix's claim of 150 meters is somewhat believable in my testing. I put a receiver on a lightstand by my house and walked down the street until it stopped firing consistently. I then went on Google Earth and measured the distance to just about 150 meters where it fired ~80% of the time. At 100-125 meters, it fired 100%. I do not own a flash that could do anything significant at 100 meters, but if you're doing outdoor portraits with a very long lens, this distance might be useful.
So yes, get the Strato II's. You won't be disappointed.
EDIT: Obviously, the OP already has this information, but I can say from experience that all these features of the Strato II are accurate and very useful. I've never looked at the Aster's but I would have a very hard time recommending anything but the Strato II. They're that good.