In my opinion the average C64 user is satisfied with MMC Replay. Using the SD card to transfer files. Maybe the a little above average user find it more flexible to buy a 1541 Ultimate, which costs less than Chameleon.
Chameleon looks very interesting but mostly to advanced users coding demos and games. The average Joe could be satisfied with a lot less, even a dos PC with parallel port and Star Commander for transferring files.
Anyhow, reading about Chameleon is attracting I must say and I might as well buy one one day. Coll idea about the built in C64 info book