I've been on the Sister Ship Liberty. You don't say whether it's your first or one of many, so if it is a first I'm sure you will love it. Drink prices are about the same as RCI, NCL but no drink packages are available other than soft drinks. Food & Service were as good you'd expect on a four star line, & better than some I could mention.
Booking the Glory for May 2009 [east caribbean],just returned from a cruise
on The Liberty [west caribbean] Fantastic all the way no complaints.
No need to take out a soft drinks package as free all day.
We were on the glory last week, 2 barcadi & cokes were $10.93 & 2 budwiesers were $11.00.