In my opinion this is one of those plugins that should be installed to enhance the appearance of Rhythmbox. Neat, clean, direct and elegant with a flavour of Rhythmbox's chosen ‘style’.
This is a great upgrade to the original interface. Much cleaner, simpler, and makes better use of space. The one flaw I've encountered is that there's no persitent search bar, just a button which wedges the bar in above the library. It would be nice to have a constant search entry on the menu bar, where there's plenty of space for one.