I have the Flex XPs from a few years ago, and they have been my go to practice shoe for indoor golf for a while now. I believe these are an upgrade. They feel a touch lighter with a bit better grip, but they are still very stable (unlike the Hyperflex which I would avoid at all costs).The back of the shoe definitely sticks up a bit, and at first I was a little concerned, but its actually great. Makes it very easy to step into the shoe without stomping on the back of it, and even in low cut socks, there is no rubbing or anything on my heel. They also breath very well. I haven't taken these outdoors and really don't plan to, but I think they would be just fine unless it was really wet outside. On my indoor hitting mat, they have great traction.My only small complaint is I wish there were more options that didn't have the white trim at the sole. It looks so good when brand new, but it will not look that way in 3 months.I believe they fit as expected. I am pretty much always a 12 and that's what I got. I bet I could get away with an 11.5 in these. My feet run narrow, and I always feel like FJ shoes are just a touch big. In the Tour Alpha, I had to go to an 11.5, but with these, I will stick with a 12.