I don't find on-running very usable. I'm trying to filter the list of hiking shoes, and

1. I'm not even presented with filters until after I click a "show filters" button – they default to hiding useful elements just so that the page looks more minimal when initially displayed 2. every time I add a new filter, the page reloads and the filters scroll back up to the top, and I have to scroll down the iframey-type interface on the left to get down to where I was in the list of filters

Mammut doesn't put its filter UI inside of a separate tiny scrolling box at least, though it does annoyingly scroll to the top every time I add another filter. Also, after browsing shoes for a minute, it interrupts me by greying out the screen and popping up some advertisement.

Thanks! That’s exact what I was looking for: great design and usability. And also cool that on-running is a Solidus store, which is the framework I’m working with.