Quick update: the Pocket Wizard FlexTT5 have been replaced with Pocket Wizard PLUS II and I could not be happier. I kept the MiniTT1 to mount on the camera since it is much smaller than the Plus II and this combo works perfectly.
Warning: Because the MiniTT1 only has the choice of 2 channels while the Plus II has 4, it might cause a problem in a multi photographers environment but that is about it. I tested it through multiple walls and around corners and they triggered every single time. I will do some long range testing soon but so far, so good.
While a few of my friends tried to convince me to get Radio Poppers, I stay away from these. I do not like the fact that they require a flash on top of the camera to operate. Too much gear to carry around!