I had trouble with my EO reflect blue dichro. I called them about it and they tried selling me a much more expensive one. Apparantly mine was right on the boundry of the wavelength.
I was persistent with the guy so he tested and hand picked one for me and swapped it over at no cost apart from posting the old one back.
The new dichro had a massive decrease in losses compared to the first one sent..
I guess being a pain in the backside payed off
Mark