I really liked most of all the design of these triggers and their reliability. For the price they felt quite sturdy with nice aesthetics in my opinion. More importantly probably though was how efficient my set of this transmitter and receiver were. So efficient in fact that I hardly ever noticed they were there. This was the best (for me) compliment to offer for an auxiliary peripheral like these triggers because they simply worked well in the background (similar to how a good bass guitar in a band usually operates).
Some details about the triggers usability would be my next point. The receiver takes either AAA alkaline or rechargeables. The trigger uses a small circular battery (like in watches). Both the transmitter and receiver seemed to last for a long time - I've only changed batteries for each part of the triggers once each.
The range of the wireless connection between the two is fantastic, in my experience anyway. Although I haven't tested it to its claimed range of 100m yet I have yet to discover them being ineffective at any distance up to around 20m - the maximum distance I have used them.
A couple practical things of note would be there is a useful indicator on the transmitter and receiver that flashes red or green to signal 'readiness', which I found extremely useful. It didn't take long to figure out what the various blinking or steady red or green 'ready' states meant. For example when changing the group on the receiver to either the A B or C group the receiver's indicator goes from blinking red to constant green when the corresponding group on the transmitter is correctly selected.
That would bring me to my next practical observation: the groups. There are three groups to which the receiver can be assigned to. If that group corresponds with the set of groups or group on the transmitter then the flash mounted on the receiver should be triggered. The way the groups are arranged on the transmitter would start to become useful if you had more than one flash.
So overall (wrapping up this shortish review) I found them to be almost perfect so far with only a few non-fires (though this might have been the flash mounted on the receiver) and I have used them a fair bit.
