I have recently been on holiday in a wonderful house in Cornwall endowed with a Yamaha CLP-665 GP (GH3X action). My home DP is a Kawai VPC1 (RM3 Grand II action) and I also own an MP11 (Grand Feel i action) which I am in the process of selling.
I moved to the VPC1 from the MP11 because the MP11 action, while a real joy to play, is too lightweight compared to most real pianos I come across (e.g. my teacher's) and adapting takes me more than the hour of my piano lesson.
I enjoyed playing the CLP665 a lot. The action is substantially heavier than both the VPC1 and the MP11, but adapting from the VPC1 was not too hard. And coming back home the VPC1 feels really lightweight!
Main takeaways: The keys on the CLP665 feel substantially more plasticky than those of the VPC1 and MP11. What I liked most of the CLP665 action was the quicker return of the keys compared to the Kawai. Once you adapted to the higher downweight, playing trills was easier on the CLP665 thanks to the faster rebound.
All in all, the three actions are great, though different. I could live with any of the three, though I still feel the VPC1 is the best halfway house for being able to adapt relatively quickly to a wide range of actions. Furthermore, its responsiveness to changes is velocity curves is unsurpassed (definitely compared to the MP11).
The Yamaha actions in the better CLP range are nice but heavier than the average grand-piano.
Of course, the piano your teacher has is probably more akin to the Yamaha.
I think if you only play your teachers piano once per week, there would be no point in change.
Yamaha actions do rebound faster, it's one thing I do like about them.