My family has cruised on Celebrity 8 times now and we've had Concierge class, Sky Suites, and standard balcony suites. Best bang for your buck in my opinion is the balcony suites. In our CC class room, deck 9 we received fresh flowers thru out the cruise, and a late afternoon "h'orderves". Nothing really different from deck 6 standard balconies other than the flowers and h'orderves. Just got off the Infinity from the Alaska cruise out of Seattle and we received a free upgrade to a Sky Suite. Slightly larger room, different layout than our other standard balcony rooms, or the CC class room. But....we had a "butler". The butler brought in tea and cookies at 3:45, and the "h'orderves" at 5 or so. Fresh flowers also. Our bathroom had a bathtub/shower. If anyone had trouble lifting their legs, they wouldn't be able to get into it to shower let alone take a bath. Very high/deep. I'm glad we didn't pay for the Sky Suite because I don't feel it was worth any extra money. Plus we had an increase in tip rates because of the butler. Don't get me wrong, it was nice to try it out, just glad it was on their buck and not mine.
My personal preference is Deck 6 rooms, 6016 - 6030 or 6021 - 6035. These 16 rooms, have twice the size balconies as any other balcony room for the same exact money. If you do internet searches you will hear about the "sweet sixteen" rooms. These are great for larger familes or for parties as we have done on our many Caribbean cruises. Granted the best views are up higher, but I've done Alaska Hubbard Glacier in 2005 with room 6027 and I will tell you sitting on my own deck not having to hassel with everyone jammed up on deck 10 and 11 trying to get a picture was great. We still saw the same things as they did, only we didn't have to deal with the crowding. My Sky Deck room for this recent Alaska cruise was on deck 7 and we overlooked the lifeboats and they block your view of the ocean directly below room. So really there's good and bad in every room.
Again, my favorite is any of the mentioned 16 rooms. I have booked them each time I go and haven't been disappointed. I will say the M-class ships are showing some wear and tear. I love Celebrity and have recommended them to many people, but the one common complaint I get from those going is the condition of the fabric on the chairs and the carpets. I've never noticed any issues with the carpets, and this has been the first time I've noticed the chairs showing wear and tear and dirt.
Still with all that, I'm still doing Celebrity again, next year on Infinity from SF to Alaska, and 2011 on the Equinox.
I do know they cruise often and use that cabin so its a good one. (43)