Once again, I agree with others.. the equivalent effect of "just above top speed you will see" has benefit but there is a huge difference between 90 and 95+. Too much difference is counter-productive.
Some other considerations...
...the colored dot drill may be tough since most pitching machines don't throw regular seamed baseballs very accurately. You could put the colored dots on the machine balls I guess.
...we use the machine primarily for bunt practice. Hitters can take reps at their own pace and, while supervision and instruction is almost always preferred, this is a station that can run itself with some general direction.