I haven't done it yet, but I'm about to and I'll report back to how it goes.
I've done all the other ambien/jwh/nitrous, dxm/jwh/nitrous combos but never both dxm and ambien at the same time. I'm very well experienced with all of them in high doses numerous times, and I'm keeping the doses low so I think I'll rather enjoy it quite a bit. 300mg dxm, 5mg ambien, 1 hit jwh and 1 hit nitrous.