Wow. Flat stands and double braced monsters...
In my opinion, which lacks all humility, the flat based stands do just fine. I have Ludwig, Slingerland, Camco, and a few others. I like the Slingerland best because:
1. It has a more adjustable and more stable tilter.
2. It has a greater height adjustment (you can make it taller).
3. It has a more stable base.
4. The wing on the bottom is larger and easier to deal with.
5. The legs are a bit more hurky.
There are a few other items, but they are more in line with looks.
The Camco is a VERY close second.
I play soft and very hard at times. I have cymbals up to 22 inches. None of them have ever been an issue on these stands. As far as "why" these flats went out of style.......look at the large hardware that came out to replace these. It's just too much. I've used most of it over the years and can attest that you just don't need that much support unless you're holding up toms. Cymbals do just fine on the flat stands. Never had one slip or fall...ever. As far as DW is concerned - I firmly believe they are in cahoots with the steel industry. They put so much mass into those stands that it takes two people to carry the hardware case of most setups. Freekin' heavy stuff. NEVER AGAIN! Way too much steel to hold up a cymbal.