After using this mixer I found The power is good and It is easy to use.  the beaters are easy to install and release.  Just clean the beaters in the dishwasher.  The dough hooks are an added bonus.  
As I used it I found it is easy to change the speeds while mixing.  I made cookies and after beating the ingredients together (the cookie dough was thick) the unit was still cool.  Very happy with the mixer, it is easy to use and does a good job mixing.  Looking forward to using it frequently.