Has anyone used or seen the Exped Wallcreeper sleeping bag? I'm looking for a summer weight bag, and the low price of the primaloft version of the Exped is attractive. The listed weight (under 2lbs for the 5'9" version) also seems reasonable considering the price. I like to read at night so being able to put my arms out without being unzipped is also very appealing. Also, how does primaloft hold up? I've used down and polarguard, but not primaloft.

Thanks,

Bill