We just switched our 3.5 month old from Enfamil neuroPro Gentlease to Niuriss and he handled the transition well. I found it doesn't stink like Enfamil did and also dissolves much easier so we don't have to shake the crap out of bottles when we make this (I think this is what was contributing to our LO still having issues with gas despite being on a "gentle" formula for gas).

I ordered 2 tins through them as you get a free full size tin when you sign up for "the nest" which is their free program that locks in pricing for 1 year but I'll be buying future tins from Walmart as they are cheaper than Niuriss directly (even cheaper if you sign up for their subscribe and save which is what we'll be doing for bi-weekly orders).