I've been a huge fan of the Trackpoint for many years, but unfortunately it's always been plagued by annoying drift issues, where the cursor keeps moving in one direction and you have to fight with it to make it stop. This has been an issue on older IBM ThinkPads as well as modern Lenovo models. It's a disgrace the technology hasn't improved much (at all?) in the last 20 years that this is still a recurring problem.