Sorry to bring back an old thread but I have input
I have a Sinn U1 with the cheap dg2813
It is a very good rep for the price but the sweep is not smooth at all, when the watch is running on it's back it's like any 21kbph watch...sweep is a bit choppy
When the watch is not perfectly on it's back the movement is very choppy, it beats normal then misses a second, then beats 3 times a second then 2 times a second... you get the picture? the seconds hand is too heavy and there is too much slack in the movement. and all the dg2813 sinn u1 do this.
I still love my watch but if I had to go back I would go for the 2836 asian or ETA
Here is a video that I took: