I dealt with modules LW 2 times.
One time I bought 2W green LW c module about a year ago, I bought from Winni. Module come with marriage, broken driver, laser not light. I sent the unit back at their own expense, and later they sent me a normal module.
By the time I lost about 1 month. Since only after receipt of the defective unit they sent me normal.
the second time I bought two pics module 4W green LW. that much more expensive, mind you.
One of the modules was defective, the problem in size and divergence of the output beam. it was a horror (see photo)
That's such an entertaining statistics. Purchased from 3 modules (not the cheapest, not 1W) 2 were defective.