I have 2 sets of Whidden dies. They are very good, and come with a shoulder measuring bushing to assist in arriving at shoulder set back dimensions. The 308 version I have must be the equivalent of a small base die judging from the amount of force required to lower the press handle that last 1/8 inch. The seating dies are similar in design to Redding.
I have read elsewhere that they use a reamer to make the dies that is compatible with PT&G chamber reamers, and since my 6.5x47L is thus chambered, the sizing die for that cartridge works very well in my rifle.
I'd buy more if I were to get another chambering.
Plus, John Whidden is a competitor and a really decent fellow.