Dielectric Diagonal- Yes or No?

Hi, I'd like to know if the William Optics 2" 99% reflectivity dielectric diagonal is worth the extra $$$ compared to the standard WO 97% diagonal? I will be using the new 2"'er in an Orion by Vixen 102 f/10 refractor.

Thanks for the help, Mike

You probably won't be able to see any visual difference but the dielectric is much more resistant in cleaning (the lack of which would influence your picture). Check also the Stellarvue version.