We are using similac sensitive/lactose and we love it!
DS was EBF until 2 weeks ago and we made the switch.
He seems to digest it pretty well now and isn't too gassy from it. When we first made the switch he had a rough few days learning to digest it but once his tummy adjusted he was fine with it.
We are using the pre-mixed that you just add water to. DS has digestive issues and our pedi recommended this over the powder saying the powder can clog up more, but after talking to people who have used both power and mixed they haven't noticed to much of a difference other than the cost.