I have tried to work up enthusiasm for the Comet backpack (and the Mariposa Plus as well - which IMO is a superior pack design), but I just can't get past my concerns about all the mesh pockets. I'm sure the mesh they use is light and relatively durable, but do I really want a significant amount of my gear to be out on display and exposed to rain, UV, branches, and prying eyes? I've read the reviews that say mesh pockets are great for drying wet items, but if I have anything that needs time to dry, I can just as easily stick only that item under a strap and keep the rest of my gear tucked away.
I do think it's important to keep some gear (and/or lunch) easily accessible, and the mesh pockets are good for that, but just about any pocket would be good for that purpose.
As for me, I'm going to hold out for the new OHM. As far as I can tell from the sneak peeks a few BPL members have enjoyed, that pack will be light, generously sized, comfortable to carry with up to ~30lb loads, and be free of that annoying mesh.