I've been running a model W for 4 years and have had no issues other than light intensity. They are very bright and if not careful you can easily over drive your plants without CO2. When I purchased mine it came with a troll master controller included from the mango tech store. The price was steep at around 1k but with the warranty and the track record it was well worth it. I personally would have a hard time trying another manufacturer as thinkgrow does make a solid light and have been around for a long time. Right now Mango is running 30% off model h but I would still recommend getting a troll master hydro-x. I'm sure there are better or equal quality lights that are more reasonably priced but it's hard to stray from something I found to be this reliable.