Love this! We bought it for our daughter (have since been given a preloved Twilight Turtle for use while we're out). The Tranquil Turtle is so much brighter then the Twillight Turtle so that in itself was worth it for us! The sound isn't loud enough for our fussy baby but for us it works just fine (when we were testing it out the sound was so soothing my hubby fell asleep right away). I like that it automatically shuts off in 23 min (why 23??) but wish that you could have different time settings. It runs out of batteries quite quickly and requires a screwdriver to change the batteries (not too easy when you have a tired fussy baby, but it's sure safe!) I think we use it about 4 times a day though, and it last for about 3 weeks... All in all a great product which baby loves, she was fascinated with it the minute we turned it on for her and it helped to set a good sleep association - we use it for soothing time before she goes to bed, it's still on when we put her in the crib. Would recommend this product, but it's not a 100% necessity.