I am currently building a Russian Gaz AAA with quad maxim.
What really has impressed me is the quad maxim. I have built a lot of white metal wargaming equipment, from many different manufactures and I have become used to having to do plenty of cleanup and to deal with vague and imprecise fitting of parts.
The quad maxim is a bit of a revelation - I have never had a white metal kit before where the parts were so clean and the fit was so precise.
Cheers,
Nigel