Looking to buy a Kubota Kommander Z122E

[Mq32shooter]

I was just about the pull the trigger on the Kommander Z122E, when the dealer told me it had a Briggs engine. I had spoken with a couple of folks in the lawn mower sales and repair business that told me to stay away from the Briggs. Everyone told me they had valve problems. What's up? Are they any good or should I buy something with a Kawasaki or Kohler? I have about an acre to mow and don't mow that much as it's at my farm. Typically, I have to use the shredder behind my Deere to cut it first, then jump on the mower to finish it off. I probably would not use it 15 hours a year. But if I spend the money for a Kubota, I want it last a very, very long time.