Their portable lineup is loud and reliable. Send me the serial number, and I can tell you the history of that generator.
If it's an older genset, Generac simply supplied the alternator, and B&S supplied the caging, electronics and the engine.
If you can find a Generac with an actual Generac engine in it, go that route. Especially if you can find one with a 990 series engine. Those things are bullet proof.