Another vote for great customer service from Crimson Trace.
I bought a CMR-201 for my RAP 9mm and love it...though admittedly not using it much. When I gave my Father in Law a Security 9 for use as a HD pistol, I purchased another CMR-201 from a seller on eBay for use on it.
The seller listed it as "New" and unused, but it definitely had at least been mounted on a firearm. No big deal, but the beam appeared "splattered" and not a sharp dot, like my other one on the RAP.
I contacted Crimson Trace and they suggested a couple things to try to clean the lens in case it was just some "smutz" on the lens. It wasn't. There was something definitely wrong with the unit.
I thought I was out of luck, since I bought it from some shyster on eBay. I was wrong...they shipped me out a brand new unit and I sent the defective one back. They even gave me an extra supply of the little cleaning swabs, since I used up a bunch to try to clean the defective unit.
They are a top-notch outfit.
Aqualung
PS: I also use the free battery service as well for our two CMR-201 units. I don't do it every year, since they pretty much never get used...but this post reminded me to send in for new ones...