I have a Zulu 40, have had it since last September. I like it a lot. I primarily use it as a day pack, although it is never full for that use (when the whole family goes out and I'm the water mule, it is close, though!). A couple winter showshoe and climbing trips as well. It is very comfortable, seems well made. Carries just fine with a 3l water bladder and the usual stuff for a long day hike. No regrets about the pack or the 40l size.
I agree that it could use a few more attachment points -- I wish it had sleeping pad straps on the bottom -- but I bought it primarily for day use, so I can't complain. I have strapped snow shoes under the hood straps and carried an ice axe without issue. The only time I wished for more attachment points was climbing Mt. Hood this spring, where I wanted to carry a shovel, foam pad, etc. I ended up having to carry my old heavy less comfortable Vortex pack for that climb. But that is the only time the Zulu hasn't met my needs, and it isn't a mountaineering pack, after all.
As it happens, I've lightened up my gear enough that I can fit everything inside, so it will be my solo 1-4 night pack as well. When I get a chance to take such a trip, of course ...
