I like the Progress but how does it compare in your experience in comfort (smoothness) to Osprey, Variant & Ambassador? Worth upgrading to Osprey or Ambassador? I'd say efficiency is also worth comparing because the differences in blade clamping and manufacturing tolerances mean at approximately the same settings (mild or medium or aggressive), does the Osprey or Ambassador provide a closer shave with same or greater smoothness? I searched the forum and google, couldn't find much on this, oddly