I hung on in vain to my Combat Touring Boots for a couple of years beyond the time I thought they needed replacing, hoping Aerostitch would get them back in stock. I had worn them for about 15 years, with one re-sole, over many thousands of miles. I really liked them, and they are still functional, if not a bit worse for wear inside. However, they lack some recent technical developments in motorcycle footwear, particularly malleolar armor, which my son, the ER nurse, says he thinks is pretty important.
After much looking, I settled on a pair of Rev'it Discovery OutDry boots a few months ago. It was really a toss-up between them or the Sidi Adventure 2's, since both had the technical features I wanted. I chose the Rev'it product because they were just more attractive to me, and, so far, I'm pretty pleased with my choice. The Discovery's are a little tight going on, but once my foot gets past the ankle stricture, there is plenty of room for my toes in the well-armored, breathable foot box. Walking around is very comfortable, and I couldn't say that about my CTB's. The BOA lacing system is fun to use. I only wish they were a couple of inches taller, like my beloved old CTB's.
Hope this helps, WBill