Xantrek xpower backup power

Is anyone using Xantrek Xpower for power onsite for there flashes, laptops or printers?

i do a lot of onsite printing, sometimes as much 100 13x19s in a day. i usually use a generator, but im wondering if my vagabond will do the trick, my sources tell me that i should get around a couple hours of use. but dont quote me on that.

I also do up to 100 13x19 prints in a day. Paul Buff thinks the vagabond will work. I have use a marine battery with an inverter. I just picked up xantrek 400 and have a couple of hundred 8x10's to do this weekend. I'm going to see how long it last.