Ok. Good to have some others opinion.

To me the welds look nice and the overall impression of the kit is good. But I'm just an amateur and there are no hot rod builders here were I live.

I've also read about problems with the rather narrow crossmembers ability to support the lower A arms during hard braking. This problem is supposed to excist not only on the FM crossmember.
The braking forces will pull the A-arms backward, of course. From a side wiew all the aftermarket M II crossmembers are narrow, so the forces can either bend the lower A-arm mounting bolt, or even worse, cause crossmember brekage in the lower A-arm mounting hole area.
On my FM kit a pipe with a triangulated piece of metal is encosed. It is supposed to be welded in on the rear side of the crossmember to fill the gap between the crossmember and the "legs" on the A-arm.
The other manufacturers must have similar solutions, since none of the aftermarket crossmembers are wide enough to fill the gap between the "legs" on the A-arms.

But according to some people this is not enough.
Have you heard about this?
(Excuse my bad technical-english language.)

I'm not saying this is a fact. I've just read about it in some other hot rod forums.
But then again. Some people seems to have their biggest task in life to write bad things about FM, Heidt's, TCI and the other well known manufacturers.