For the past 9 years I have had an ML320 and was persuaded to trade it on a new Lexus. So I get the RX 350 and all I can say about it is that the fit and finish are great. For the rated horsepower it seems to underperform. I was used to a car that was much heavier with a lower horsepower rating that outperformed this dog. All I can say about the handling is that it reminds me of an old man car like the old Buick LaSabre. Very boring and no feel of the road. If you own an M Class hold on to it and treasure it.
The power rear hatch... the only power on this dog.
Get some road feel and if you are going to claim more horsepower please make sure it performs.