If the maximum width you can have for a tank is 48" then yes it is worth it. It gives you 7" more width and will allow you to house more fish.
If you can go longer on the length then I'd wait and find either a 5' 100 gallon or jump up to a 6' length (120+).
If you can go longer on the length then I'd wait and find either a 5' 100 gallon or jump up to a 6' length (120+).