Hyperion 3

Yes, for most runners the Hyperion 3 fits true to size, so your usual Brooks size should work. The fit is on the sleeker, performance side rather than roomy, with a secure midfoot and heel. The toe box has a little room but is not wide. If you have broad feet, plan to use it for longer runs, or sit between sizes, going up a half size is the safer choice.

You can, but for most runners it is not the ideal marathon shoe. It has moderate, firm cushioning and no carbon plate, so it lacks the deep protection and energy return that make long races easier on tired legs. It is better suited to 5k, 10k and tempo efforts. If a marathon is the goal, a plated racer or a more cushioned shoe will serve you better over the full distance.

It can work for a newer runner who wants something light and versatile, but it is not the most forgiving choice. The ride is firm and neutral with no stability support, which favours runners with an efficient gait. Beginners who want soft, protective cushioning or who need support for overpronation should look at a daily trainer or stability shoe instead. As a second, faster shoe once you have some miles in your legs, it makes more sense.

The Endorphin Speed 5 is a plated tempo shoe with a livelier, springier toe-off and more forgiving cushioning, which makes it more capable over longer fast runs and half marathons. The Hyperion 3 is simpler, firmer and cheaper, with a direct road feel and no plate. If you want maximum pop and versatility for race day, the Speed is the pick. If you want a light, honest tempo trainer for repeatable fast sessions, the Hyperion holds its own.

For a lightweight speed trainer, durability is reasonable rather than exceptional. Light, fast shoes trade some outsole rubber and structure for low weight, so expect the Hyperion 3 to wear quicker than a heavy daily trainer if you use it for all your miles. Save it mainly for tempo and faster days and rotate it with a cushioned trainer, and the outsole and midsole will last a good deal longer.