I have just bought a Lenovo X1 Yoga and am having the same experiences as the posts here. Lenovo are a good solid make and Synaptics make the touchpad. Synaptics helped develop the Precision Touchpad so I would expect this to be the best possible example. I think Microsoft have gone back in performance. With the level of standardisation the Precision Touchpad will bring it should be an easy job to get it right.
1 The touchpad is not sensitive. I need to move my finger a few mm before the pointer moves. This makes the touchpad hard to use for accurate work like photo editing and it also makes regular use messy.
2 The touchpad gets confused between two finger scroll and zoom making browsing and scrolling difficult.
3 The scrolling for text files is handled differently to web pages. Text file scrolling is handled by the old mouse settings of 1 to many lines at one time which is clunky. It is also very slow. I write software so scrolling through a large source file is slow hard work of multiple swipes to move a few lines. Non Precision Touchpads scroll freely and smoothly.
4 There is a delay in the touchpad responding.
5 The movement of the mouse is not consistent. Sometimes the scrolling works free and easily and others it is like pushing through treacle.
6 The touchpad jumps to the top of the screen at random times.
I tried installing the previous (non Precision Touchpad)drivers from the previous X1 model and many of these issues were fixed but it still was not perfect. So I think it is not a hardware issue it is a Microsoft issue.
I got my X1 Yoga replaced and the replacement was no better so that is going back for a refund.