We had been on the Royal Princess in summer 2016 in Mediterranean and wanted to see the Regal. We had crossed west to east on the Caribbean Princess in April 2017.
The Regal is a comfortable large ship which does not overwhelm you. We were in a starboard mid-ship balcony in Aloha 535. The voyage was smooth and really uneventful, if you like sea-days this is a fine choice. The cabin was more than adequate with a comfortable King bed. Plenty of storage areas, a large screen wall TV, sufficient outlets, and well appreciated toiletries. The shower was smallish but very user friendly. As most travelers find out their best friend becomes the room steward quite quickly.
Food was very good with a few exceptions. Lobster tails were just not tasty at all. King crab in the "Crab Shack" "specialty" seating which was just part of the Horizon Court buffet, was quite disappointing. However almost every fish entree in dining room was cooked well and served nicely. Portions are reasonably sized; though of course some folks order more than others. Entertainment was almost always excellent and theater often filled earlier than some liked. The daytime entertainment and enrichment events were quite extensive.
Cabin was clean, modern, comfortable and well equipped. Balcony had simple functional chairs and small table. Shower was smallish but quite good and easy to use.