My wife and I decided we would buy a new KA mixer for Christmas. The 20 yr old KA 5 qt lift bowl mixer she has is still chugging away, but I wanted more dough capability and she wanted more capacity. So, we bought the Commercial 8qt KSM8990.
The basic mixer seems to share some or all the head parts of the 7 qt Commercial mixer KSM7990. The speed control has a soft start position and a protective stub guard to prevent inadvertent bumping of the speed control lever to the on position.
It's a pretty nice mixer. However, I noted that the yoke that holds the bowl flexes quite a bit with a mere 600 gram load of flour 62% hydration dough. I suspect they're going to have replacements of them from breaking.
Also, we wanted a flex edge blade beater and we found out the one for the 7 qt Commercial is fits the 8 qt as well. In case anyone wants a flex edge beater for their 8 qt Commercial, the p/n is KAFE7L and the box states right on it that it fits the 7 and 8 qt and even lists the KSM8990.