It works well, but I didn't like it aesthetically.
I prefer MKS tensioners.
They have a 5mm for track bikes and an 8mm for Mountain Bikes.
MKS tensioners don't have as much range of adjustment as Surly Tugg-nutts, which means I have a different chain for every cog and chain ring combination.
I don't mind the extra chains.
The MKS tensioners disappear in plain view, whereas, to me, the Surly Tugg-Nutts just shout "look at me."