Not sure which looms to compare it with for you, but the David loom has a nice shed that stays for quite some time when you're weaving as well as when you are at the end of your warp.
Have you looked at the video from Season 1 Episode 8 - A few things about looms, 1.8.2? At the 5:00 timestamp, you'll see how wide the shed on the David 2 is. There's also a new video on JST YouTube channel with the David 3 loom you can have a look and see. Typically, you'll get about 2 1/2 inches wide shed on the David 2 which is what I also have like Sandra, and I'm also quite happy with it.