2012 - First Marathon - Nike Frees (Recommended by a high schooler working at Dick's Sporting Goods - I had no idea what I was doing)
Results: 2:41:xx Full // 1:19:xx Half
2013-2016 - 2 Marathons per year - Nike Pegasus, Brooks (no memory of model, but they were traditional trainers.)
Results: 2:38:xx to 2:40:xx - Could not crack 6-flat avg for the life of me // 1:15:xx Half
2017-2018 - Joined a club. Learned a bit more about actual training - Nike Flyknit Racers and Adidas Adizero Adios.
Results: 2:33:xx Full (3 times) - Could not crack 2:30 for the life of me // 1:10:xx Half.
Sub-2:30/Sub-1:10 was the lifetime goal. Those times seemed godlike to me. If I heard you ran 2:20-2:24, I assumed you ran seriously at college, or were some kind of sponsored/semi-pro.
2019 - Nike 4% (the blue ones) - Breakthrough...
Results: 2:26: xx (2x in 3 months that Spring) + 2:23 that Fall // 1:08:xx Half
I never hit a wall. It felt like a completely different game. I was shocked at how easy things felt in the first half of the race, and I negative split the crap out of everything that year
2021 to 2024 - Vaporfly, Alphafly, Saucony Elite
PRs: 2:18:xx // 1:06:xx... (most races: 2:22:xx / 1:08:xx)
I used to see sub-2:30/1:10 as a "shoot for the stars", lifetime goal. I can't imagine ever running over 2:30 again with these shoes. It really is a completely different game. Post-marathon recovery used to take up to a full month. Now I'm back in sometimes under a week. You can race a marathon a month if you want. It's awesome.
The way I describe it is that the "wall" is no longer a "wall". It's more of a sand pit. Pre-shoes, you'd hit mile 20, and your legs would turn to wood. Lifting your leg was a struggle, a every foot strike into the pavement sucked away more and more life from your stride. Your 5:xx/mi pace would slip to 6:xx without you noticing, and then immediately you'd fall to the 7/8s, and all the motivation in the world couldn't get you to pick it back up because your legs were just gone. That doesn't happen anymore.
I've found that as long as I don't quit on myself in those final miles, if I was running 5:20s, my blow-ups just turn into bouncing along at 5:50s-6:00s for the final 10K. The shoes provide this little bounce with each step even after your legs are gone, and that little bounce can help you keep a cadence going even when your muscles are spent. That's where I've seen the biggest difference.
The thing that really fascinates me is the guys with sub-2:20s pre-super shoes who have PR'd in many shorter distances since then, but cannot go sub-2:20 anymore. I know a few cases like that. Maybe they're trying to make too big of a jump?
In summary, I got to 2:33 / 1:10 without them - 2:18 / 1:07 with them...