Happy with the purchase for the most part. The andural software is definitely different if you've never had one of these types of lights. It can do a lot but can be confusing at first, and its easy to screw up the settings. It doesn't come with temp sensors properly set and etc so you have to do it yourself or the light won't function properly. This really is an issue because andural monitors the temp and lowers the brightness accordingly. Both the LM10's ordered originally wouldn't hold turbo for more than a few seconds because it thought the temp was higher than it was. This is certainly something the factory should be setting for their customer vs expecting them to figure it out for themselves. $100 is not chump change to the avg Joe, and such negligence is concerning as it only take 15-20 sec to set once you know how to do it. Light seems to put out the lumens claimed when compared to other similar output lights I own but in a much smaller package. Machining is nice, and it feels well made. Haven't had it long enough to testify to its durability and it is a china based company vs U.S. Overall I am pleased with the light and would consider purchasing a lumintop again. Killzone has been extremely helpful in answering my questions, shipping speed was excellent, and they offer their service as a middleman for any possible warranty claim needed. A+ seller who goes beyond the norm to satisfy customers.