after I add the stowaway program to my HP IPAQ I find that I have to reset my IPAQ every time I want to sync it . I do not know if it be the IPAQ or the Stowaway do it but before I install the program I could sync it without difficulty . I do buy a refurbish IPAQ so that may be a contributing factor too . I wish the keyboard do not require battery ; I have a old GoType keyboard that would use the battery power of my old palmpilot . I wish the Stowaway could do the same thing . the compact size be nice but it do compromise the function of the keyboard . there be not dedicate number key so you have to push a function button and a letter key to get the number . if you want to use the special symbol associate with the number key you have to push another function key . this can be annoying . with a real fast speaker that go thru a slide show quickly I need to type fast at time and it be a hassle to remember which function button to push . I usually carry a bag to put the keyboard and my IPAQ in when I go to a event where I may need they so the compact size be not a necessary function for I . the smaller size may benefit some people who carry thing in they pocket but with all the portable device we carry nowadays I figure most of we will carry this in a bag . at least most woman will pack it in they purse . a extra set of number key would make this function better . a advantage of the function key be that they can pull up you calender , contact , email , etc by just use the keyboard . do not have to tap the screen to open these program . the infrared communication work well . no lag or mistype . setup with the disk do not have my model on it but I just go to the websited and download it from there . setup be easy after that . like other people note there be a hinge in the middle half so you need a flat , hard surface to type on . I probably would buy this again .