I switched to plus 50 several years ago with no complaints, and yes, I am running longer between change intervals. My experience and everything I have seen of this oil is that it is an excellent quality oil.
I use +50 in our equiment on the farm and also in my truck. I am very pleased with it's perfrmance. You can run 50% longer than your hours listed in operators manual in a John Deere engine with a John Deere oil filter . So you could now run 150 hours.