One piece of advice. When I bought my cord, I had the option of a single unit or one with several different tips. I took the later becase if I bought a new computer and it didn't have the same tip plug size, I would have to buy a new cord.

Also, instead of the em-power plug being attached permanemtly, I also have an adapter for the cig. lighter for the car.

This works great because I can use it in the car, airplane and my girlfriend can use it with her computer too. Other wise I would have had to buy her another cord. I just wish I could get an adaptor for the regular elec. outlet that way I don't have to carry around both the reg. cord and the empower one.

One set back is that the interchangeable tips of course can be lost. They fit very snug and I have never lost one, but there is no latch or clip for them. The packet of (I believe 3 different sizes) tips was included in the price. It was also $5 cheaper than the other set.