I own a Brooks B-17 Narrow, and a B-17 Imperial (cut-out version of the B-17). The imperial helped to relieve some pressure concerns, but my Imperial also became lopsided because of the cut, and was rendered uneven and uncomfortable in the end.

For clarification, the B-17 Imperial was a prototype model from Brooks during their product test last year. They could well have fixed any potential problems, or perhaps mine was simply an anomaly to begin with.

The standard and narrow B-17's are quite fine as well, if you're not an individual who suffers from pressure discomfort to begin with, then these saddles will not cause you to suffer from it.