I was in the same boat eyeballs, but I finally made my timber purchase today. Soooooooo, We will see how it does against a 600 MH and HPS. Dan AKA RainDan told me the 4vs will ship out Tuesday since they are closed this Monday for Holiday. I have a brand new empty 3x3x6 tent waiting patiently. It is ready to go with a carbon filter sucking air into the exhaust fan which is located outside of the tent. Carbon filter simply sucks the air from inside tent into the fan that is located directly outside the tent and then pumps the air up into the attic and outside via my attic vent. I also have pcg genetic clones sitting under my T5 light just vegging and patiently waiting for the Timber Light. I have PCG Wedding Cake, Double Dream, Bubba Diagonal, Mochi, Lemonade, and Oakland Purps. I also have Aurora Indica feminized baby from nirvana because I am a Northern Lights/Afghani whore lol. Anywho, I am very excited to start and will definitely share the results if anyone wants to see my experience. I also have a 7x7x7 tent with an HPS and a chinese cobb led as well as some outdoor so I am excited to try Timber and see what all that hype it about. Heard nothing but good things from them. I am really excited to not have to air cool my light for once as well. Anyway, if anyone is interested in results and a grow diary then I should be posting next week or the week after. Just waiting for that light. Attachment just shows my setup with no oscillating fans yet, only the exhaust fan and carbon filter with tent. Any suggestions would be cool