As a single developer working on niche market graphical printing applications, I could not afford to mess about getting the wrong UI component library to revamp our existing applications. I spent about 4 months evaluating various suits. I finally opted for Nevron, largely due to the excellent color, docking and command bar features, but also partly due to the fact that they have a real try-before-you-buy policy that let me completely test out their functionality before forking out my hard-earned cash.