I recently ordered four basic messer trainers from Purpleheart. After a about two months of use, I wanted to share my impressions of the product.
The TLDR version is that these are excellent products for the money, especially for a club. While I would not want to spar full speed with these due to their lack of flexibility, their weight and balance provide a good approximation of much more expensive trainers. I am very happy with the handle length for practicing handle wrap plays. I also really like that the nagel is attached by a ring backing making it removable. When we have a lefty in class, it is an easy task to reverse the direction of the nagel rather than having to have lefty specific gear on hand. The plastic material is very strong and I really like the grey color.
If I am going to nitpick, I would say that the design places the nagel too far away from the hand to mimic the dimensions of a steel messer. Additionally, the curve of the nagle is such that inverted parries tend to bounce off rather than stick. Flipping the nagel upside down helps, but likely puts more strain on the design than intended. Still, for the price, I believe these to be small issues and would not prevent me from ordering more if we had a need.
When we do spar, I use the higher priced synthetic messer, also from Purpleheart. I love this messer and highly recommend it despite the higher price point. https://www.woodenswords.com/Type_III_Messer_p/type-iii-messer.v4.htm