Does anyone have experience with "The Juicer" portable power unit from McCormick's? I am currently using a homemade system of a marine battery>inverter>power conditioner built onto our synth cart, but those items combined with the synth, speaker, and amp make for an extremely heavy cart. We are looking to move to an external power supply and powered speakers (eliminating the amp).

What are other people using that seems to work well for you?