I'm also using a 4GB Hitachi Microdrive, but I don't see any real advantage compared to an SS CF card. Amiga doesn't use a swap file/virtual mem and the number of writes to HDD in general is incomparably lower than in the PC world - any CF card should last for 10+ years. I'm using a MD just because I had one spare from doing an iPod Mini CF coversion.
EDIT: Ah, a 100th post
