Review on Perixx PERIPRO-303 X4A Trackball With 1.34-Inch Replacement Ball For Perimice And M570 - 4-In-1 Multi-Color Trackball In Red, Purple, Pink, And Lavender With Stylish Storage Box by Adam Davidson

I literally just got this, and the difference is incredible. I mean, that probably sounds like an exaggeration, but seriously. I got this to upgrade my Elecom EX-6 wireless trackball mouse. I needed more control for gaming, and more precision for productivity.So to go into detail, the difference is amazing. The original ball that came in the mouse seemed great, it was smooth, and glided effortlessly, but over time would stick. It would slide smooth, but not gradually. In other words, trying to make small movements would cause jittering as the ball would stick and release. Trying to click small buttons, or highlight text characters would be a real challenge, as the cursor would jump across a word instead of smoothly across a few pixels as intended. Trying to aim in games was almost impossible, like the mouse was overdoing every small movement.Now, the upgraded red ball. I chose the smooth glossy one because I wanted smooth control, and that's what I got. Instead of effortlessly gliding, the ball has enough resistance to give you that sense of control, like every movement is intentional. No free spinning. Also, it does not stick. Even on high tracking, when the cursor should move fast, I can still make adjustments one pixel at a time. You have immediate control, rather you want to swipe across the screen, or navigate to an exact point, even a hairpin size point. It's so natural, and effortless, better than I expected.This upgrade was essential, and any mouse it fits in would surely benefit from one of these.Small update, just wanted to say it's been a few days, and I've noticed the experience has been great. My accuracy with the mouse feels effortless now. If that changes over time, I'll update this, but if this doesn't change, you can consider it to still be true. Really glad I got this.