are they good or are they crap
No need to replace the oil, if I tighten it up it is almost impossible to turn the bars. I think it has 21 settings, and I think mine is set on 8. So there is plenty of adjustability.One of my friend here in Québec city is a professional racer and he always used Toby damper. I think Toby got a damper for road use and race use. But as usual just change the grade of the oil inside will give you more resistance all along the adjustement range.
I never ear him complaint about this damper, so it should be good, I know he tell me it's rebuildable so you can have it forever.
I also think it's less expensive then a Öhlins so.....