Works best pushing chain down. Not as convenient as the spring loaded tensioners when removing the rear wheel...but works way better and is dead silent. I like it much better than the Surly model I've owned in the past.
Using in the push up position on a vertical dropout road frame ridden in SF for daily commute - route has some roughness - with good tension result. Whisper quiet. Installed in minutes. Seems bomber. Looks good :)