As previously posted, I've done four of these darn DHC's over nearly 11 years of ownership (two on each of the front doors).
It doesn't help that I keep buying knock-offs but the OE items are insanely priced here in NZ and don't seem to be much better (other than the fit).
In terms of fit etc., just for the record, the knock-offs I've tried are: -
Autopa - pretty average fit (meaning not good but manageable if you know how these work) - poor lifespan. Poor feel too - feels "broken" and spongy from new.
Frey - great fit (as good as OE) - seems to last well (not replaced it yet, after two years) - feel is not quite OE but close. Recommended.
No-name - this is the most recent replacement - fit is very poor, but I made it work with some tricks I've learnt along the way. Lifespan is unknown (it's lasted over a year so far!) but the feel is pretty good, at least as good as the Frey - it opens the door positively at about 50% of the travel.
The last two I've fitted (the Frey and the No-Name) have been mod-ed with the AWR-Fix and seem to be working well but I have the Continental units on my eBay watchlist for next time...