We've cruised in suites before and loved the extra space in the room, but this was always on S Class, before E Class came out. We really didn't know what to do with a butler and rarely asked anything of them. But as I say, we liked the bigger room and access to Blu.
We went concierge this last cruise on the Ascent; the inaugural. We enjoyed the four MDRs. I don't regret anything EXCEPT the lack of access to the front of the ship, which is for Suites (the retreat) and the Aqua Spa (for aqua class). Being in concierge, we had NO access to the front of the ship, which I always enjoy...and I didn't realize it would be this way when we booked Concierge. And then, in addition to the lack of a proper promenade deck, it made the ship feel smaller, because the Retreat takes up so much space at the front.
I don't know if now it is similar on S-Class if you're not Aqua or Suite, but for our 2025 cruise on the Beyond (E Class), we booked Aqua....so we can at least use the Aqua Spa for the front of the ship (Unless there are some kinds of changes I don't know about).
We still loved our cruise on the Ascent. I mean, we booked the Beyond so that's self evident. Still love S Class too. It's just unfortunate that if you're not Aqua or higher, you can't get to the front of the ship. Feel free to correct me if I am wrong!