I know ... it's "old" technology, but I still use an antique Sony Ericsson T68i. And this add-on more or less upgraded my T68i to a T610 level. In fact the MCA-25 gives better quality images at higher resolution than the built-in T610 camera.
I now can take pictures, transfer them to my Tungsten T|3. If necessary I can even send the picture as an email attachment. There're more additional steps involved here, compared to the times when I was using a Zire 71, but this works for me. And fun too ...
A sample of a picture taken from this tiny camera can be viewed here.