I first tried flats a year or so ago and I'm a convert. I love the thumpy tone, and I love the way they feel. I also love the added tension, but as to why, I cannot really say.
I'd just buy the bass maker (Sandberg maybe?), not the bass. Then I can get any bass I can dream up made AND make more money (hopefully) and buy more bass companies and so on and so forth until I'm the Bezos of bass (Bazzos?).