DISCOVERY twice.....Transatlantic with a week in the East Caribbean 4 years ago, then in February this year for two weeks in the Eastern Caribbean when DISCOVERY was a guinea pig cruise as things began to open ip again from Covid.
Also been on DREAM and CELEBRATION when they were Thomson as against Marella. Different label, same excellent VFM cruises
Also did lots of cruises of different lengths and Ports of Call aboard several of Her Majesty's Ships of the Grey Funnel Line.
I don't think that DISCOVERY 2 is much different from DISCOVERY, so what do you want to know exactly? You'll fine lots of views on the Trip Advisor Cruises Forum, and also the Cruise Critic Forum.