I've gone through four bike locks and am currently on my fifth. My first two were shitty cable locks from Specialized. I preferred them over U-locks because I permanently mounted the head under the saddle, ran some coils around the seat tube, and then let the last few coils reach out to a clip I mounted to a water bottle boss. No one could unlock/lock up their bike faster than me... but nobody was wearing through their aluminum frame with the coarsely covered coils sawing away at their seat tube faster than me either. I had to join the masses and get a U-lock.
Of course, my first U-lock became obsolete during the Bic pen scare of 2008.
The only non-cylindrical lock out to replace it right away was the Fahgettaboudit, which I bought despite its almost five pounds of mass.
I can't explain to you how nerve wracking it is to think that your bike is locked up, you need it unlocked to do your job, but the last time you locked it mighta been the last time it was going to function.
I dug through all my spare keys ( I save the worn-out ones like an old person saves dead hearing aid batteries), and they were just as bad or even worse... but then I found the clunky LED key they include with every lock.
It did not work like that.
I have now gone through five keys on my current lock and have three beautiful new keys in hand.
like new feet on my who-knows-how-old box fan.
I really love my fan. I don't think there's anything wrong with saying that.