I may have a different perspective. I grew up using either a hand electric mixer or an Oster Kitchen Center, which has a stationary mixer on it. My personal favorite is my Hamilton Beach from the 1940s, but I am like that.
My mom recently got the Kitchenaid Professional 6 qt mixer. My husband made pizza dough several times, and mom has used it for various cakes, pies, etc. Since then they have managed to strip the plastic gears inside and it doesn't work, so my dad is having to replace them. That being said, I have always dreamed of having one, so was super stoked to get to use hers.
So, the bowl has an up and down setting. You have to put the bowl on, then maneuver the mixing paddle in under the arm around the bowl to plug it into the arm to use. Then you have to raise the bowl up to reach the mixer. There is no room for the rubber scraper to reach into the bowl to help the stuff inside mix in. You have to turn it off, lower the bowl, scrape, raise the bowl and turn it on again. Repeat. Repeat. The bowl is stationary when it is on the mixer, and so you can't turn it to reach the stuff in the bowl better like you can with a normal mixmaster. I found this very tedious. I felt like I had to "manage" the mixer so much more than I do with either one of my other ones.
Mom got the metal bowl, which is fine, especially because it is so much lighter than glass, but you have be sure not to make anything that will react with metal like gelatin....Oh, and you can't really see into the bowl because it is metal on the sides, and the top is covered by the mixer arm.
I am not saying to get it or not, so many people love them! I will say though, that I was glad I got to try someone else's before I bought my own. I don't really want one now, and neither does my husband. Mom misses her Oster Kitchen Center and would prefer to have it back instead. If there is any way you could borrow one for a few days and do some typical baking that would help you discover if it is really what you want. As for me, I don't.