I bought a Seamless stowless last month and love it. I'd never go back. I thought the benefit would be in packing, but for me it ended up being more in the openings, which became much smoother on my Katana. I got one made a 120, and the fit was pretty tight, but I hear the logo on the canopy makes a difference. Customer service is really awesome - SR is a small shop so they actually have time to care about what you have to say. Build quality was excellent and it took about a week to get my bag in (custom colors). If I downsize to the point where I need another bag I'll def order from these guys again. Not looking for / buying rubber bands is cool too. I have no experience with Downward Trend, but the concept is pretty simple - I can't imagine there would be a huge difference in practical application. I know SR makes an option for a longer flap for wingsuits. I'm not a wingsuit guy and I have no idea what it does.
