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The speedlite transmitter (be it an ST-E2 or a flash) will give you two major problems:
1. It only allows for E-TTL operation on the flashes. This means that if you include a flash in your shot, you get a (heavily sometimes) underexposed image, because of the very strong flash light. You can compensate the flash exposure, etc, but in the end, it is a PITA so you have to be careful not to "see" a flash through the viewfinder. The fun is bigger if the reception hall contains mirrors or windows, and the flash light gets reflected off those...
2. The range of the transmitter is poor. It works for close distances but it becomes completely unreliable when the distance grows. Another problem is that you need direct visibility between the flash heads and the transmitter. While this is not completely true, as the signal can reflect from walls, windows, etc, most of the time you have to position yourself so that the beam from the transmitter "sees" the flash, but this on the other hand contradicts the situation 1 where you need to avoid having the flashes in your frame.
These two issues make any kind of Infrared transmitter a good toy to try a few creative lighting setups at most. Far from being a reliable tool for lighting a reception hall. All I say here is from my personal (unpleasant) experience with the ST-E2 and flashes. Well, I bought the ST-E2 more for having an AF assist light than for triggering wireless flashes, but for the times I tried to use this with 580 Ex flashes, it only worked for a few things.
If you want something serious, buy radio triggers. There are plenty of these on the market. I am using Pocket Wizards, but there are also cheaper one out there. With 2-3 flashguns and radio triggers you can do some nice things.
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