I'll quickly relate my experience with airless tyres. I bought one because I had been suffering flats a lot, and my tyre was pretty worn. I was short of cash, and the LBS suggested I try one (this was 10 years ago). I bought one, and tried to put it on my Ernie Clements (I know, I know, sacrilege). It took me forEVER plus to get it on, and of course, that makes sense. After all, with a clincher, the inflation of the tube holds it on the rim, and they can STILL be pretty tough to fit. This thing has to stay on using the same tension it applies when you fit it......

Anyway, it took about 1h 30, but I succeeded, and took it for a run round the block. Seemed fine. Next day, I take it on my commute (yes, I commuted year round, rain or shine, on an Ernie Clements....). Not too bad until I went down the hill leaving town. This is a pretty steep fast descent, couple of bends, traffic, and a really bad road , lots of bumps and potholes. This was where it really got exciting. My ass got battered, in no uncertain terms, and what was worse, I was half out of control, the back of the bike was leaping all over the road, and it was scary. I had to use this tyre for some months (no money), and it really only got worse, and fairly quickly took my wheel out of true as well. They suck, don't buy them.