Ah, yeah. So, here was my thought process:
EXCUSE TO BUY NEW GADGETS! PURCHASE ALL THE GADGETS!
For the Logitech Performance MX: I got it a day before I got the trackball.I played around with it, and I took to it relatively well, though given my own narrow mindedness about mice and over two decades of sticking strictly to one style (give or take), I have to say it feels very comfortable to hold, but the sensation that I'm actually moving the cursor with a sofa under my hand is still there. It's something of a beast, size-wise, and my hand muscles are just kinda working their way around it. I think I could adopt it, however; with my small(ish) hands, it's just going to take a bit of self-adjustment.
The wireless trackball...I'm not self-delusional enough to not admit that part of that purchase is aesthetics: I love the blue-and-graphite and the general design is cool. But the main reason I decided to give it another go (I owned one around eight years ago when I first went off to college, though I rarely used it...it was I suppose the predecessor to this one, Logitech and white with a red ball) is that I've been developing some wrist-and-shoulder trouble that I can only assume has to do with my constant computer usage, and as I'm right-handed, and it only occurs on my right side, I can't imagine they're not related. So I figured that if I could adapt to a trackball, keeping my wrist in a stationary position would be far more beneficial and possibly aid recovery to those pains.
My biggest concern with the trackball is simply one of control; my thumb is simply not all that dexterous. I can do most tasks fairly well, even play Diablo 3 with decent skill (tried it for a few hours last night), but it's hard to rely on my dumb thumb when I'm trying to manipulate fine-detail graphics. Still juggling both, though, and seeing how they go.
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