Yes, I would recommend a PS for 50's PTC for lunch almost anytime of the year. It is becoming a very popular restaurant and sometimes even with a PS, there is a wait. No PS -- an even LONGER wait.
My DW and I have always enjoyed this restaurant and never been disappointed in the food or the service. Some servers are definitely more animated than others. On our anniversary trip last year, we had Uncle Wex -- who seemed subdued, until he found out we were celebrating our 25th wedding anniversary. After that we were "hounded" whenever any new diners came in and with great fanfare, Uncle Wex announced our anniversary over and over. Uncle Wex was not loud and boisterious as some, but he knew how to create a great time for us.
Tip: When you check-in at the restaurant, you can ask the CM to put you in a "room" where the server is really animated or vice versa (if you want someone who is a little more subdued).