I have 16 of these lights and use them intensively for back lighting and set lighting in the theater, music events and video recording.
The color mixing is good, the white channel allows for a wider range of (pastel) colors and given the price difference between the Compact Par Tri and the Q4 I would always opt for the Q4.
The light output is decent, not comparable with a 1KW par 64 but they beat an old 300W par 56.
I run them in DMX 6-channel mode, the 11-channel mode does not give you many additional options, except for the random strobe, which is easy enough to implement on my light desk.
They use a high PWM frequency, so there is no noticeable flicker, not even on video.
A local company has installed more than 200 of these in different venues, and according to them these lights are quite reliable.