I compared info on as many as I could find conveniently last September, and bought the APC "Mobile Power 140", for $40. Stumbled with it throughout a few day couple thousand mile trip, quite satisfactory, and same since. Being familiar and happy with a lot of APC UPS stuff was part of my choice, also price for capacity. Becomes a little warm in use, not surprising; has an on/off switch, which is desirable; has 1 120v 3-prong outlet, at least one other non-major brand had a 2 outlet model. Haven't had to plug in eg both laptop and cell phone charger, but I have a short multi-outlet extension cord I'd just plug in and use. With this, I don't have any need for a special auto power supply. On Wed, 9 Jun 2004, Anna Dembska wrote: . . . > Does anyone have any experience using an inverter or converter with a > cigarette-lighter end to plug the standard power supply into a car or > battery pack? There are 75- 175 watt inverters available from Belkin > and others for about $30. I'm trying to decide if I can buy one of > these or if I have to get the auto power supply. . . .