I had/have the Blue Rhino Skeeter Vac. I chose it 'cause it has an on-board generator (no batteries or AC hookup required), and the big version claims to be able to handle 2+ acres. I have all that and a pond.
Wellsir, it worked okay, when it worked at all. My problem was that I couldn't get the ignitor to light off the gas, and there's no place and no way to get an external ignition source (read: match) to it. Many calls to the Blue Rhino people ("it should work...") produced nada, so I gave it over as a bad business. I must be particularly tasty to the little bastards, 'cause Deep Woods Off and Cutter's isn't keeping them at bay. I've 'bout given up on my yard in the evenings.