When my old faithful KA started to sound a little strange, I looked at what my options were. I had heard and read that the new KAs were not as good and ran across a Bosch mixer video. I took the plunge! I have been very happy with it and only recently needed to upgrade to a Hobart.
I learned a few tricks with the Bosch though. For dough, I whipped the butter, sugar, eggs, and flavor with the cookie paddles, but then switched to the dough hook to finish it and had to stop and scrap about three times to get a good mix. I did manage to cram about 4 #'s of flour, 3 c of sugar, 2# of butter, and all the rest in there though! For RI, I whipped the water and meringue powder with a hand blender first and then would use the cookie paddles to mix in the sugar. I added half first and the a quarter and a quarter. Then would let it come together, just barely so it wouldn't over mix.
I would still be using my Bosch if I hadn't increased in orders. It worked really well for me for over a year before I out grew it. I did have to replace the scraper as the part was a flimsy plastic, but it wouldn't mix the same with out it. I did crack a cookie dough paddle once, but just once.
Hope that helps and best of luck on your decision!