Well if it is a Briggs, it is a good engine, my 20KW standby has a Briggs in it and I have never had a problem with it, it takes over when the power goes out and it does not even affect my computers, it is that quick.
When looking at gensets, I don't even worry about what the name is on the outside, the guts of the unit is what matters and believe it or not, most of them are made by the same companies. My standby as I said has a Briggs in it, but the same model they are selling now has the Kholer in it, which I believe is made by a division of Briggs. When looking at small engines these days, it is really confusing.