357 Magnum was my 2nd choice before they came out with the newer model.
It wasn't first because Hydrogrowled just came out with a similar new model too (which I believe magnum copied), and it had a 3w, 4x4 foot print, which was perfect for me. The owner of HGL gets no support on most forums because of some trollish behavior and one infamous transaction that was VERY poorly handled.
Despite the bad rep of the owner, not many people dissed the product itself. Just the general hate for LED's. It seems like they learned from their mistakes, and I couldn't be happier with my light. Too run my 336x pro for a month without ever turning it off only cost about $16-18 more on the electric bill. Considering I wouldn't usually run it that long, that's some super cheap electric. The brightness is intense and will burn your eyes in the spectrum of red and blue...... which means when your done working under your lights, your vision will turn all green for a minute or two while they readjust.
This was the best source of information I found on LED grow lights when I was shopping.
http://www.myhydroponicgardening.com/