I have been using the Trango S, Trango Extreme and Koflach Expe for all of my mountaineering adventures. Trango S is a summer boot with comfort for long hikes. I did the JMT with it.
used the Trango S for three JMTs, but after the alst one I am done with it. Not very durable is one issue(one was replaced under warranty, second now pretty shot but still holding together), but my biggest issue is the lack of cushioning in the front part of the boot and the really tight toe box. I already wear the thing half a size larger than I should and I still get bruised toes in there after just a day or two.
strengths - lightweight for the level of support, and pretty decent breathability, zero break-in time. Ties quickly and waterproof for quick stream crossings that aren't too deep.
For my next big hike, I am looking for a boot similar to the Trango S but with slightly more comfort. 15 years ago I had a pair of Meindl trekking boots that were just about perfect for my needs. Can't get my hands on Meindl boots in the US, though.