I use these for two of our church drum kits. (18", 24")
Set up is simple and quicker than I imagined, the bungee system is effective in isolating the mic and it feels very secure. The composite 'shoe' is solid and I have no fears there either.
This has sped up our set up time, and it keeps things simple for our team of amateur musicians and engineers. One of the main benefits is that I can save a channel strip on our digital desk, safe in the knowledge that the mic placement remains the same.
I think it excels in smaller kick drums. Placing the mic in the centre of our 18x14' kick totally shifted the sound and gives much more thump than I would normally expect from a 'kick-in' microphone. To the point that I stopped using my sub kick.
I connected a short XLR cable to my microphone and cable tied it to one of the bungee cords, this allows me to dangle the end out of the kickport and makes for an easy connection.
If you are looking for one less thing to set up while gigging and have a smaller kit it's a no brainer. Just buy it.