I put these on my 35 year old Yamaha FG-series dreadnought, because I was specifically looking for strings that are low tension. They feel pretty slinky and are easy to play. The sound is pretty good: warm and round, with rich overtones. They are maybe not quite as crisp and sharp sounding as some other brands. The gauges of the 3 lowest strings are light (30, 40, 50) which really tames the boomy bass on my Yamaha.
Concerning durability, they seem to last as long as the other major brands. I change them every 6 months.