deskthority

Having both, I'd say CH is much more usable than ITAC on modern systems. Of course I keep it in doubled resolution mode, but even native one outperforms ITAC's 192 PPR.

Mechanically they're nearly identical: exactly the same type of bearings & shaft diameter, but CH have slightly bigger ball and ...

My understanding is, these resolution codes just reflect shipped state of DIP switches. Native sensor resolution on my DT225 is 360 PPR with capability to divide or multiply it by 2 with DIP setting, and I have never seen pictures of other variants with shutter discs visually different from mine ...

Attaching detailed info on a trackball I found a documentation from producer - it can be switched to few different protocols actually and have few DPI options to choose.

New CH DT 255 costs almost 2 times more than new CST - L-trac trackballs. At least when you don't buy them in bulk.
Here is ...