I have the HH and have used it a couple of times.
Two words : It rocks! - literally, if there is wind, it would sway gently from side to side (reminds me of a boat), and as the American euphemism goes, it's a really good lightweight piece of gear. I got the standard model before all the fancy asym models came out.

Sleeping in it is not a problem. You could lug a pack in side if you wish, but I'd just leave it on the ground unless it was really pouring and there are critters about waiting to get into your pack.

Oh, yes, I works well in the rain. The Rain fly keeps the rain off and allows plenty of ventilation. And it works well in the humid and hot climate here in Singapore as well as keeping the bugs out. ( I used it out on military exercises - ha! No sleeping on the floor for me! )