Just bought my 3rd 4th and 5th. These things can get you out of a lot of sticky situations, but most importantly they've allowed me to eliminate all stands on the drum kit. With these, pluss a couple a56d's i can have a full 12 channel drum patch with no stands needed.
This is great for quick turnarounds as a touring engineer as the kit just has to be set up, and all mics are already pre clamped perfectly in place, just plug and go. Then when the show is over, just pull all cables and the kit can get lifted off.
Also useful in weird situations, need to get two cats over the stage access with no cable ramp? Clamp them up high and use them as 'hooks', taping the cables onto them.
The price has gone up by £10 since i bought the first two. Not a deal breaker but not ideal.
Overall id suggest investing in a pair, You'll love what they allow you to do.