One thing IMHO you should consider for any camp/spare shoe is whether if your main portage shoe falls apart, your camp shoe could get you thru the rest of the trip.

We've seen in past reports, that shoes that were supposed to be the best, fail miserably at least for some people.

Would hate to be deep into a remote area and have to rely on a camp shoe that couldn't do double duty if I needed it too.

I can see that shoe being popular but at just 7 oz, you have to wonder IF they would give enough support/grip to haul a pack/canoe across a rough portage. :-/

I guess you'd have to by a pair and give them a little field test.