are you referring to the pe-war IIId that was really a IIIc with a self-timer? If so, get a IIIc instead. the IIId was issued in such limited numbers that it must be considered a collectable only -- whereas a IIIc is pretty common and can be had for relatively little money.
A IIIf is newer and not much more expensive, and can be had with a self-timer if you look around.
As to usability -- they're all screw mount leicas which means they're nice to use, but the viewfinder is separate from the rangefinder and you have to use supplementary finders for any lens but a 50, and the finder is not as big, nor does it adjust for parallax, like the M-series.