The U-lock is big. For me this is an upside as I can really lock the back wheel + the frame to pretty much anything.It's a bit on the heavy side but so far I have managed to carry it in my backpack when I commute.I tried to using the quick release bracket, but I have a water bottle holder and it barely fits.Overall, it is a good lock. I live in a safe city and there's no way my bike gets stolen with this one.This lock gave me peace of mind.