Like many things in life, it's all about context,
If I was going to leave my bike for 2 mins to grab a coffee after a solo ride, I would use the Ottolock.
Apparently you'd prefer to use nothing at all? So you'd rather have no theft deterrent, and no bike, but you would have and extra $50 in your pocket. Yay?
No, this is not a strong lock, but no one is hauling around a 10 lb Kryptonite ball and chain after a solo-ride-with-no-car to get a coffee.