They have a lot of flaws and lack features, but they play on all maps and right now on one of my servers I'm using them and I wanted to use them on another one where I have a parachute and so far it's not working. Otherwise, there is no option to die automatically when there are no real players alive, to collect custom things from the ground, etc.
Also, I'm noticing that yapbs are putting more lag on my server
It seems to me that it wouldn't be too difficult to write a plugin to make them hold +use when they're in the air, but I can't write it myself