I have both the ColorQ and the TF-100. I use them both.
Reading posts on this site, you will find that they are not too well thought of here. Most people here say that the ColorQ is not accurate or consistent in its readings.
Could be that I just got a good one, but over the past several years, I have crossed checked the ColorQ with the TF-100 and found my readings to be basically the same.
The ColorQ runs a calibration routine on a clear sample of your pools water. After that you add reagents, to individual test tubes to test for FC, TC, pH, TA, CH, and CYA.
That said, the TF-100 (or Taylor K-2006C) is what almost everyone on the site uses. It makes sense to me, if I'm posting numbers here and asking for help, that I should post TF-100 numbers to reduce any confusion about the accuracy or reliability of the test kit used to generate the data.
I do find it amusing that if someone posts an obviously incorrect number using the TF-100, it has to be user error (which I agree with) but if the same thing happens using the ColorQ, it has to be the test device. In both systems, there are minor things that can be done by the user to throw off the readings.
One plus for the ColorQ is that you do not have to match colors when testing for pH. You also don't have to look for the "dot" when testing CYA.
One downside for the ColorQ is that you can't test FC above 10, so it is useless for doing a SLAM.
I could go on, but I'm sure by now several people are unlocking there gun cabinets..
Let me know if you have any specific questions.
Jim R.