The Memplug adapter fits into the springboard slot in the back of the unit. At most it adds about an ounce or two to the units total weight. It comes with several applications already loaded on the unit, including a file mover, photo application, and document reader. The document reader, CSpotRun, can access files that are stored on the memory card. This is what really sold me on the device. Since I like to carry around e-books on my Handspring, this will allow me to have more than two or three books available at any point in time.
One of the things that annoyed me about this device is the amount time that the applications that access the memory card take to load up. I understand this is probably because it is loading the file into memory. While it doesn't take that long, it is still annoying.
I also had one other minor problem. When I first started using the card it seemed to act strange at times. After a quick visit to the company's website, I downloaded a new driver for the unit and that cleared up everything.
In closing, the MemPlug SmartMedia adaptor is something that should be on the buy list for all Handspring users. It works well and does what it says. For the price, the ability to increase the memory available to your handheld is well worth it.
I've had my Visor Deluxe crash on my more times than I can remember and lose all my data because I was nowhere near a computer to sync it. This memplug allows you to save MULTIPLE images to your CF, SM, SD, MMC or whatever card. Their latest firmware upgrade even supports VFS (Virtual File System) as much as the OS 3.1 is capable of handling.
I do have a few software conflicts (ie: MobiBook), and its reliability is not superior. However, it IS functional and the quirks can be dealt with.
On a sadder note, Memplug's Customer Service is not all that wonderful, but apparently getting better. Their manual is written in what appears to be English edited by a non-native speaker - as is some of their interface software. Other than that, a FINE product!