I realize the original poster responded, but I am currently in the process of going through this transition and my experience may be of use to you.
The thinkpad was the latest machine I got, after a string of macbooks and one XPS-15. I made a concerted effort to switch simply because I'm spoiled on OSX trackpads, and the thinkpad trackpad widget just isn't up to par (especially on ThinkPad + Linux). I asked a few colleagues how they got around the trackpad issue and a couple mentioned they just use the nipple cursor.
It's been a few months now. Changing over was really annoying at first. As the other poster mentioned - the key is learning muscle memory for _sensitivity_ to control the speed of the cursor. A light firm touch with a small pressure in the correct direction is all that's necessary for moderate speed.
I use my left index finger to control the cursor, and my left (spacebar) thumb to at the same time to click/drag/etc (as the mouse buttons are right below the spacebar).
Middle-click + drag-down for scrolling is really convenient.
I find myself having just crossed that midway point where the new system is becoming dominant. The trackpads are starting to feel somewhat unwieldy and cumbersome to me now - even the macbook ones when I use my wife's or friends'. It feels like they require too much hand movement, and are far more "gesticulatory" than gentle pushes and pulls on the nipple cursor.
I think I'm faster with the cursor now than with even high-quality trackpads.
If you do end up trying it out, be prepared to tweak settings a bit to get the right ones for you (and as the other replier mentioned - don't skimp on sensitivity), and be prepared to spend a couple weeks feeling like your hands are tied when you want to move the cursor around.
It gets better after that.