disc locks can work but the qr levers need removing from the wheels as no point other wise.
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If they take the wheel off they still have to carry an awkward heavy bike. If its just a random nome de plume that thought they would ride it away it gives you half a chance of catching them.
Problem I have is general laziness. I am in a shop, are 10 feet from the bike and can see it out of the window so think I am safe!
My Fly 12 Camera has a built in alarm but I never use it and know I should.. Reason being is again lazines, tardiness, call it what you will. I tried it a couple of times when I bought it, but, as usual and unlike the iphone app the android app was way behind and bugy as hell so to connect and set the allarm took longer than nipping in the shop for soom beers, and to disarm also took just as long and I looked a complete pratt when I set off my own alarm, so I never used it again. Loads of updates since then so its likely much better now so perhaps I should try it again, but it just shows that although some gadjets appear to be a good idea they are sometimes not so good in practice.