Technical Mittler Bros louver dies?

Has anyone used the louver die By Mittler Bros. How did it work? would you recommend it?

 

Some info in this thread.

School me on louvers - Mittler bros louver dies

 

I bought a set of 4" dies a few years ago and they hold up well on my press but had to adapt them to my machine which is a shop built hydralic with an air over pump. 16 and 18 Ga no problem but it struggles with 14 gauge on the floors ( have to dress the cutting edge so only on My projects) I know this is a old thread but I ordered some off ebay from England Half Mittler Bros price even with shipping and they work well on 16 and 18 ga.