The reviews are correct: the TT1/TT5 do not have bulletproof reliability. There's a learning curve to extracting the best performance possible, things like setting your camera to not auto-power-off, setting the flashes to not auto-power-off, choosing low-interference channels, aiming antennas, etc. There's also a learning curve to the TT1/TT5 units in general - sync timing, second-curtain settings (which are really convenient, BTW; I love the safety net of not having to enable SCS or HSS manually, and being able to have both SCS and HSS enabled simultaneously). The software isn't the most intuitive, but you can learn it with time.
I think the question is this: how far away will your flashes be? If <200', TT1/TT5 are a great choice, and the feature set makes them a very worthwhile choice. If 200-400', I'd suggest using ONLY the FlexTT5 units - the MiniTT1 is sexy and small, but doesn't have the reach of the FlexTT5 in my observations.
FYI, we have three Canon SLRs and four 580/2s. I started with three Flex units, thinking I wanted to stick with AA-powered gear. I quickly added a MiniTT1 and really liked it. I later added two more Flex units, so I could use two cameras and four flashes on a regular basis, and could buy a trigger cable for the second camera, triggering off the Flex. I'm now contemplating another Mini, and desperate for a pair of the ZoneController units.