Anyone has any experience with Horseman Exposure Meter 45? Here is what they cla im:

TTL meters for average, full-area measuring on the film plane. Read-out of film surface value with immediate computation of shutter speed or aperture setting. F its cameras like a sheet film holder. No need to calculate bellows factor for cl ose-ups, or to consider any other effect on the exposure caused by the movements or filter usage.

Is this useful? BH has a price of $945, you think it worth the money?

Thanks! Paul