Really useful for data entry. Easy to program. It has an auto power saving feature when not in use, though we are encouraged to switch it off, I'm not sure why. The only thing I would like to add is some kind of dust cover to keep its keys clean; for now, I just flip it upside down when not in use.
After a month of use it stopped working completely. I replaced the battery to make sure it wasn't a battery problem. The idea is good but the product quality is poor!