I switched from compact double to 5703 triple 2 years ago, kept my 12-27 cassette. Love it. The difference is not a deal-maker (or breaker) as I could get up all my hills on the compact, but it is a bit easier and may come in handy as I continue to age (God willing!). It also shifts better than the compact ever dreamed of. I now don't hesitate to shift the front.