I have one too. As others have said the light and laser are run by the same switch. That is one of the reasons I do not like it.
Another reason I do not like it is that when you use the remote tape switch you only have a momentary switch. You have to unplug the remote tape switch to use the tiny maintained on/off switch on the back of the unit. Plus the cord on the tape switch is too long for a standard 20" barrel/+3 extension combo which leaves a lot extra to snag on things.
Also, the unit is bulky and makes the gun more muzzle heavy.
It makes take down a pain as it does not just slide off after the three allen bolts are removed. I have to fight in on and off every time.
If you are going to use one, do not use it with a Tacstar extension as the extra weight of the LMS1202 caused the press fit tube of the the Tacstar extension to pull out of the mounting collar on me once (better yet, do not use a Tacstar extension in the first place).