They might be secure, give better braking and so on, but what a frustrating system! I've had the wheels on and off a few times over the last couple of days – been fitting mudguards and also had one puncture – and while removing the wheels is easy and quick, putting them back is not. Getting the axle through the first drop out (or whatever you call it when it doesn't actually drop out!) and into the hub is painless, but getting that to align with the other side while simultaneously putting enough pressure and twisting the axle to catch the thread always takes a couple of minutes of frustration. Do other people have similar difficulties with this? What's the trick to it?