I've got two 540ezs now and they work 99% of the time with my cactus triggers. Rejoice. The 580 still wants nothign to do with this party, although I plan to pick up a non S trigger and maybe that'll do the trick. After playing with these 540s I dont get why people like the Vivitar 285HV so much. I've got one of those and boy is it ever slow to recharge. I snap off 5 flashes easy on the 540s before I can do one the 285 (all with fresh bats) sooo I think it's time to get rid of the 285. I'd actually consider getting rid of the 580 since I always use it in manual but I like it for shooting live events since I can move the head in all directions. And one day I'll get those pocket wizards but with the 540s working so well I'd rather spend 50-100 another one (for a total of three) than 600 on PWs. Now I think it's time to get some REAL lightstands and not these bullshit ebay ones. And some sandbags. And some real umbrellas too since two of them are breaking. Uhm.. anyone want a 285, two light stands and two umbrellas (Slightly used )?