I have one and love mine. You will need different case holders for different families of cases, but other than that its pretty darn good.
I don't have the mic adjustment on mine either, however I just rough set it with calipers first then try a trim and adjust to the "perfect" length. It rarely takes me more than a minute or two.
Mine has held up very well, I cant even begin to guess how many thousand cases its trimmed to date. Still using the original cutter on it too.
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It is better to conquer yourself than to win a thousand battles. Then the victory is yours. It cannot be taken from you, not by angels or by demons, heaven or [beeep].
--Buddha