I am very happy with my AE "N" prism and its meter on my Super bodies, and it works well on my "Pro" body as well. It takes some getting used to, with its three choices (averaging, or spot, or automatically choosing between the two) but once you familiarize yourself, it is great.

I am not sure why there is incompatibility between the finders and the newer bodies, unless it has something to do with the TTL function in the Pro TTL.