The driver can either be a help or a hindrance with heat. I have two separate 2×4 tents and run a Tarantula Ultimate 2×4 in both of them. In one tent I don’t need this extension because the driver is actually some of the only heat the tent receives. In the other tent, I absolutely need the driver outside because it would otherwise run too warm. Having the option to remotely mount the driver makes a huge difference in controlling tent temperature. The extension is simple, well built, and does exactly what I needed it to do. Definitely worth having if you run the Ultimate and need more control over where its heat goes.