Szihn, interesting what you have to say about Speer, I had a similar experience. Several years ago I bought a Rockchucker press as I didn't have the time to make my own. When I got it home I noticed that the ram moved around a lot at the top of the stroke. Pulled it apart and found that the ram was 0.007" smaller than the bore which equated to about 0.060' of wobble and consequently sideways angel due to the action of the ram. I made a new ram with the correct fit and then found that the threaded hole for the dies was about 0.040" out of alignment with the ram, which I than had to also correct. In the end I re-machined all the linkages, removed the as-cast bearing surfaces and machined fitted PVC washers as well as oil lubrication holes and grooves. It is bloody fantastic now and super smooth. It was a shit load of work though as it is a casting and the only datum is the bore for the ram. More difficult than making one from scratch.
I then checked the shell holders and found that the bullet seating faces were out of parallel to the mounting face where it sits on the ram face. some were as bad as 0.010" over half an inch. In other words a 2.5" case was 0.050" out of square when entering the die. Imagine what that does to the head of the cartridge and accuracy.
I purchased quite a lot of RCBS gear at the one time as I had been using a friends dads RCBS gear for years and it was all very good, however it was older and made in the USA, unlike the current crap which is made in China (There is that word again).
I had also at the same time purchased scales, a case trimmer, a powder thrower and a strip priming press, all of them needed rework including the scales. They all work perfectly now and are a joy to use.

When I contacted RCBS and politely informed them of what I had found and done to correct the problems I received a similar response to yours. I was really pissed after having spent a shit load of money to get such an arrogant response.

I since use the Redding competition shell holders which are perfect and dead parallel or I make my own for sizes I can't buy.

Sad really that companies go and get things made in China and when it turns out shit feign ignorance and tell you that no one else has had any problems.

I despise those words "Made in China"