My Mom and Dad have owned them since 1990, and also are breeders since 1993 I believe.
They are wonderful dogs! I prefer the males, as the ones I have been around are more loving then the females. (that is not to say the females are not loving, far from it)
I have yet to meet one that is not good with kids.
For the most part, they are great with your guests. My parents do currently have a girl who is more timid then others that they have owned, but she settles in pretty quick.
If you do decide that you are in the market for one (they would get along fine with your other dog, in my experiance) let me know and I will have my Mom get me the name of a good breeder in your area.
There are a few Berner owners on the DIS, so maybe they will check in. If you have any other questions for me, just ask.