I was at the local shop Saturday with every intention of buying a PW Flex, Mini, and AC3 to get my collection started when the salesman (super nice guy) suggested radiopoppers. I would like to have the ability to use the cls system with my sb's (plan to add a 900 and maybe some more 600's) and also use them on the Alienbee's (currently two 400's with plans to add more at some point). He says the radiopoppers will do all of this just like the pw's will at almost half the cost. I have looked at the radiopopper website and it appears that the jr's are what he was talking about. The PX system looks to be about the same price as the PW's. I suppose my question is twofold. Is the only difference between the PX and Jr system the ability to use high speed sync? Secondly, while high speed sync is really cool, how often do you really need it?