We were on the Ocean Princess in March and tried PC for the first time. It was WONDERFUL. We enjoyed the lack of "time urgency" related to making it to the dining room at a particular time. We also met a number of very interesting people and got to learn about a number of different places.
We are booked again with Princess, on the Sea in a couple weeks. We are most certainly going to enjoy Personal Choice again.
I must be honest that the service does seem more "detached" than with traditional but the tradeoff is well worth it to us. The "detachment" is really no different than at a restaurant where you only interact with the server on a single evening.
Alaska here we come!