If someone told me these weren't horrendously uncomfortable to ride, I'd give them serious consideration for commuting and jawn.
100% immune to flats is worth an extra 2lbs in total bike weight for some applications.
I'm glad someone asked this question.
I have been using tires from
www.airfreetires.com for about 10 years now and I really find that they work perfectly for what I want to do.
From what I read on the web there are a lot of people who complain about them but a lot of this negativity seems to come from people who actually haven't used them.* Their 'complaint' is that they have a friend who had a bad experience with them, or they read that Sheldon Brown didn't like them.
I have a lot of respect and admiration for Sheldon but NOBODY can know everything and I am firmly convinced that Sheldon did not understand Airless tires as well as I do.
As a 69 year old retired toolmaker, I have the good fortune to have the skills to build my own wheels and, due to 'working out' regularly, I only weigh about 165lbs.
The tires I use most are 700 x 20, Nu-Teck brand (sold by Airfreetires) and they weigh around 380 grams (well less than one pound)
Hope this helps you.