my caching buddy and i wanted to go paperless..i bought him a palm m515 for his birthday. he loves it i got the tungsten t i love it too..i didn't buy another m515 it stated on ebay sale it didn't work with win xp. my buddy upgraded from 98 to xp and it works fine i could have gotten 2 m515 and all would have been great. both of us have integrated batteries and they are hardly drained at the end of the day. we both use gsak and cachemate. buy the metal case to protect, it is worth the cost also. if you are worried about batteries you can get a cable for the car. imho the keyboard is a wasted feature another thing to attach and you cannot keep your palm in case protected with it on.