I loved the launch 2's but I had issues with the 3's. The 3's were way more narrow and toe box felt smaller which resulted in the shoes constantly rubbing my toes. This model is just as good if not better than the 2's ( in my opinion.)

I am an avid runner and have tried many many different types and brands of shoes but always want to run in these. Super light weight and springy. I love the 4's please don't change them!

Update 2-7-17
Still loving these shoes. Logged about 30 miles so far. I am however starting to get blisters on my heels due to the backs rubbing my heel constantly. I think I'll try different socks to see if it helps but over all great shoes!

*Update 2-17-17*
Switched my socks to ones with "tabs" in the back. This has helped me personally with the shoe rubbing my heel causing minor blisters. Still loving this model SO much I am thinking of getting a 2nd pair for back up. Please don't change a thing Brooks!