Has anyone used a Wahu swim vest on their toddler? Would you recommend them?

My sister gave one to DD for Christmas and it fits her now but as we haven't used it yet, I'm not sure whether to take it on our holiday or not (we leave Tuesday). I would have like to have tested it out beforehand. It won't take up much room in out case but it'll be a nuisance if it's not a winner.

DD turns 2 in a week and loves the water. Should we take the vest or just get her a pair of arm floaties?