I've been using the BT MightyMouse since it came out. Works great, and is comfortable (for me, at least). It's precise enough for image work, though I usually switch to a Wacom tablet.
I also purchased the new BT (aluminum) keyboard. It has a good feel and haven't had any issues with it. However, if you need the full layout (keypad, etc.) you might need to go with the wired version.