1. It is too blocky/choppy, which makes it very difficult to use for a smaller, WFO-sized area. Certainly in the example below, the Ch 13 IR imagery has a much finer resolution, allowing a forecaster to more easily find/track convective cloud tops and their trends.
2. The default color scale makes it very difficult to determine where the higher/lower cloud top pressure values are. The blue to light purple transition above 300mb is too subtle, so convective cloud tops are not easy to find.
3. It doesn't seem to do a good job distinguishing cloud top pressures of thin cirrus, as we see below in areas east of the big convection.
Compare the GOES Cloud Top Pressure (top left) and GOES-16 Ch 13 IR (top right):
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