Yea, no-turns are very good when you want to protect their feet from overreach while riding. The no-turns have a little bulb inside that fits nicely in their heel to keep it from turning. Its specific purpose is to keep the tough end of the boots where they ought to be, and since the boots are more contoured, they wouldn't fit right if out of place.
I actually did use them 24/7 to keep my horse's shoes on. They didn't rub or irritate and they were very, very durable. He also didn't get any shoes off while I was using them. As far as dirt accumulation, I had no problems there either. I hosed them off every time I visited so they stayed pretty clean. I'd personally reccommend them. I got them because I was fed up with torn rubber ones that gave him no protection from overreach aside from the thin wall of rubber that composed them.