Robert, I used to have the opposite feeling. I always loved Model Kasten and avoided Friul, but I've just received Friul's T-55 trax, and they're absolutely beautiful! My previous experiences with their products were tainted by endless clean-up and redrilling due to a ton of metal flash. Very rough.
This T-55 set is clean and easy to assemble, and VERY strong.
If that is an indication of their current level of quality, then we got a race! Still, they are quite expensive.
I still love Kasten, though, and have never had any problems with breakage.
Some guys here even use the Kasten trax for their little RC conversions, and they hold up no problem.