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I was keen on a field de-rotator in years gone by for my LX200GPS 10". Mostly the advice I received was as Martiin noted - get a wedge. I already had a wedge at the time but was looking for what I thought would be the easy way out for longer exposures.
Eventually I set my wedge up and have never looked back. I guess some of it depends on your skies. If your skies are washed out, maybe you can't get the long exposures that a wedge would allow, and alt-az with or without a de-rotator would get you all the exposure time you need.
Dean
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