My cbr 125 was stolen twice! I had some sort of datatool alarm on it with immobilizer, as this is little bike it's mainly in little scums interest so, first time they took it, they were trying to start it , and as they triggered alarm, they were trying to shortcut indicator to blow the alarm, that didn't work and they probably were spotted by someone and run away leaving my bike in the middle of drive way of garage (or they were soo lazy they didn't want to push it uphill. Second time, I thought this is it. when I was on the phone with police reporting it, I heard my alarm going off few hundreds meters away, run in this direction and I found my bike. Apparently someone saw him pushing it and phoned up police same time. So, alarm will not stop them, but may or may not help.