I just so happened to put a level on mine today (was moving the saddle forward a tad and wanted to preserve the angle). Mine is almost dead flat with a level going across the length from front to back.

It's personal preference also. Start with the front part level. If that doesn't work for you, make very small changes. If you get saddle sores, double check saddle height and fore-and-aft before giving up on the saddle. I find them to be very comfortable provided your fit is correct. Otherwise, they will be a bear.