Lately? How recent would that be?
I got a
Kensington Expert Mouse on Ebay (because they're damned expensive when buying new) a couple months ago as I've lately found it extremely difficult and quite painful using a normal mouse due to problems with my right arm.
I can have the trackball right in front of the keyboard where I can easily reach it and it requires only the desk space of its footprint, unlike the mouse which needs more space for moving around and which I have always had on the right side (I tried using it on the left way back when my mouse was symmetric and only had a single button, as I am primarily left-handed, and it seemed logical to have it on the opposite side from the numeric keypad so as to let the main keys be in the centre, but it didn't work out, never was comfortable).
Yes, that's what I "game" with nowadays, for what relatively little gaming I do. I've never been much of a twitchy-shooter type or tried to get massive apm numbers in strategies, instead I'd rather lower the difficulty setting and stay in single player instead of competing against others, so though it might be a bit slower than a mouse, it doesn't really bother me (also, I've been wanting to have one of that series for about 20 years, so the recent disability seemed like a good excuse).