Upload & Sell: On
I guess it comes down to which head best suits one's needs. I bought the Sunwayfoto DB36 for travel use wanting something strong enough to hold the S2 if needed.
This little ball head with the dual clamp is 30% cheaper than the RRS version (which normally would not affect my purchase), it is rated at 40 pounds vs. RRS 15 lbs. and has the two notch configuration which I find prefer. I always found the one notch on the RRS frustrating. I took the Sunwayfoto DB36 in the field mounted on a Gitzo tripod a couple of days ago and shot the Leica S2 with the 120 lens and it was remarkably stable, even when the camera was side positioned for a vertical shot. I would normally avoid this position by using the RRS L plate on the S2, but I wanted to test the holding power of the head - and I had a tether on the camera just is case. Would I use it with this heavy set up on a daily basis, unlikely, I would use one of my heavier gear heads instead.
The remaining question will be the long term viability of the head. As I intend to use it with the S2 only for occasional travel I won't be putting enough hours on it to make that assessment. I'll use it as well with the Lumix GH2 but that is hardly a stretch for any head.