Can anyone tell me if the Ambient Light feature on the Spyder2 Pro version is worth the extra money over the Spyder 2 Suite? I ordered from B&H and took the salesman's advice, thinking I was getting the best version.

I know it will be worth it for priting, but what I worry about more tha anything is non-photographers (re: potential buyers) viewing my images on monitors that are not caibrated. What good does it do to get mine perfect with this expensive hardware/software? Again, printing aside- people need to see an accurate rendition of my image before they will want to buy a print.