I love Celebrity and have a cruise booked on the Equinox. Our last Celebrity cruise was on the Solstice ane we abslolutey enjoyed it.
We have sailed on the M class ships and never had any problems. What we did have was a lot of fun.
Carnival Liberty New Year's Eve 2007
Liberty of the Seas 5/2008+11/2009
Allure 1/16/ 2011
Independence of the Seas 12/29/2013 Top-notch!