Looks good but:

1. Needs comparisons against other players by size (as others on this thread are having to work out)

2. It seems better for larger size but that's where the user will start to question the service and trust comes into play i.e. do I trust it enough to warrant the saving of X. I think you need to work on this point via messaging in the design and site in general. For me I would stick with Wise for now.