Have used a 3 spd SA for some time, it just keeps going. Often it seems, these hubs have their chainring to rear cog too high. SA suggests a greater than 2:1 ratio, my set up is less than that so I have gear indexes approx 36, 48 and 64.
A few years ago, got a so called red band 8 spd Nexus hub, as I wanted a broader range. It too has been reliable and shifts well in cold weather.
I've ridden bikes with Rohlof and NuVinci hub, slightly different end uses, both were good. For overall effectiveness and reliability, prefer the SA.