This is true.They're just made better and turn out a better round.
If you ever have a chance to look at a Redding die the machining is excellent, the threads are cut to exacting size with little to no movement.
This is NOT a condemnation of RCBS or Lee products. They are well made and will load excellent ammo with few complaints from any user.
Like anything there are always going to be examples of products that are on the 'high end'. In some cases the high end is only marginally better than say the same item from a well known, popular brand that is half the price and sometimes the high end is dramatically better.
I have used RCBS & Lee products all my reloading 'life' with NO complaints. However because I am shooting .30-30 considerably more and am wanting possibly a bit better loaded round I am considering UPGRADING to a set of Redding (or Forster) benchrest style dies that have the follower sleeve that supports the bullet during the seating process. The ammo quality may only be minimally better but I really like this style of die.
I will probably look at Ebay for a set of used dies however I may be able to get for say a similar price to new RCBS or maybe a bit more. This way I am economizing yet getting the dies I want.