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I would definitely not say "Reasons and Persons" is clear. It might be precise (I personally don't think so, I think he makes tons of subtle mistakes), but it's at least not clear. It's full of ideas like "rational irrationality" which is at best a poor choice of naming, IMO.

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> I think he makes tons of subtle mistakes

That's true of (at least) all important philosophy books, isn't it?

Without context, sure, but when we're talking specifically about the precision of expression, I don't think so. Some philosophers operate closer to mathematical precision than others, and when those sorts of precision-oriented philosophers screw up their precision, it's a bigger problem. In Reasons and Persons, Parfit jumps through hoops to make his statements precise but ultimately trips all over himself (in my opinion).

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