I've been using flat base stands exclusively for about 12 years now.
I've had a couple different brands, and all worked just as well as the others. No issues.
I like DW's the most because of memory locks, the tilter, cymbal space adjustment, and now the legs have two spots they can be set at (flat or up a little) so they can go over and under each other easily.
The straight and boom stands are very sturdy. I put 20-24" cymbals on them with no problem.
I just got some of the Tama Classic fb stands, and they are surprisingly sturdy with the larger cymbals on them as well. The Tama tilter/post is also perfectly in line with the center of the stand, which is great.
That type of tilter is what I do miss about the vintage stands.