The 175 is quite a bit more complicated to learn then the 145. Three people in my systems class needed additional training during sims due to its complexity. Having studied with these three, the need for additional training was not caused by poor study habits. I personally worked with all of them regarding the airplane. This was their first jet and first auto throttle vnav capable airplane.
It just proved to be a lot for them. The program is very good but it's designed and written with the assumption that people already have some turbine experience and are used to flying the downwind of an approach at 250 kts. You add the speed of the airplane and the complexity of its automation and it's more then I think a new hire with no turbine time should be subject to.

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