Brightscreen eyepiece magnifier

I'm considering getting a Brightscreen eyepiece magnifierand would like to hear from those that have and if you were impressed or not.

Not impressed. Gave me a distorted view of any scene. I returned it and the focus screen which had such an intense ground glass appearance that it was distracting during composition. There's a long thread about the BrightScreen viewfinder and focus screen. Actually, I think you started that thread. Still thinking about it, huh?

I wish Canon would come out with a split image focus screen for the 5D2 the way they have one for the 1 series.

Regarding the eyepiece, I ended up with the EP-EX Canon extender, and removed the plastic optics.