Reddit reviews Yongnuo Upgrade RF-603 II C1 Flash Trigger/Wireless Shutter Release Transceiver Kit for Canon Rebel 300D/350D/400D/450D/500D/550D/1000D Series
We found 3 Reddit comments about Yongnuo Upgrade RF-603 II C1 Flash Trigger/Wireless Shutter Release Transceiver Kit for Canon Rebel 300D/350D/400D/450D/500D/550D/1000D Series. Here are the top ones, ranked by their Reddit score.
1, Higher sync speed than the first generation --- The highest flash sync speed up to 1/320 second (some of models may only reach to 1/250s or less, difference combination of models of flash and camera using may achieved difference flash sync speed).2, Adding the Locking rings3, Improved Flash / Shutter control Buttons4, Working for more non Canon/Nikon cameras and single firing pin cameras --- ALL Standard Hot shoe DSLR Camera except Sony and Minolta.5, Adding the power switch for single transmitter --- Set the power switch on TX (single transmit) or TRX (transmit-receive automatic switch) state according to different shooting requirement. When it used as wireless triggering transmitter and flash testing, set to "TX"; When it used as wireless triggering receiver, using shutter release or other extended functions, set to "TRX". set to OFF means turn off the power.
What triggers are you using? I was looking at either the Yongnuo 560-TX or the RF-603 II
It appears that your T3i has Live View, and that's effectively the same thing as using mirror lock-up. At that point, the only shake will come from the shutter.
If you're looking for wireless shutter release capabilities, you could use something like the Yongnuo 603 II which lets you use radio transmission to fire the shutter (huge range and doesn't require line-of-sight like IR does). I use mine mostly for that purpose, but they're also capable of firing flashes too if you decide to expand into that at a later time.
If you're solid about the $100 point, I'd recommend a YongNuo 560III for $60ish, Yongnuo YN603 wireless triggers for $30, and a CowboyStudio Speedlite Umbrella Kit for another $30.
All in all, $120. You could do sub-$100 with a Neewer TT560 flash, or a Neewer C180 monolight, which are decent, I use them all the time. Or if you can stretch I got plenty of recommendations. Cheap lighting is my thing.