my bottom pivot moved up about an inch. It's been raining pretty good the last few days, i'll get a picture soon of it installed. Belt is plenty tight. I stuff a prybar between the front engine cover (with a rag on the end) and alternator and just gently pull it it a bit to get it tight. I may have had to offset the upper bracket forward a bit.
My Falcon has a 10si, my ram50 has one, and the f250 will get one. The availability, reliability, and power output are worth the effort in my opinion. I bought 2, and warrantied one, and they were always in stock at the auto zone. They are also the go to alternator for agricultural equipment. Pretty much any old tractor you see that has been converted to 12v or just gotten a new alternator, i can almost guarantee it's a 10si. Parts will always be readily available for them