So here they are, my brand new Streak 6, bought at the great price of 50 € + 9 € delivery costs.
First impressions: compared to the Lt 3, they are a bit heavier (but still very light, under 200 g), more cushioned, even more breathable, higher and less tight. To better detect the differences, I wore a Streak 6 on my left foot and the old Lt 3 on the right one. I knew that the Lt 3 were "low", but I had never noticed how much! I really appreciated this feature, but lately my heels started complaining after each running session, even the short ones. I expect this not to happen anymore with the new Nike, due to the thickier midsole (something I don't like, though) and the 8 mm heel drop (vs the Lt 3's 4 mm). Also, the Lt 3 were extremely narrow, whereas the Streak 6 provide the foot with more space. I am curious to test the grip, which was excellent in the Lt 3, thanks to a very reactive sole. Last but not least, the color: I didn't mind the blue-orange-black combination of my Lt 3, but the dazzling white-yellow on the new Streak 6 looks really gorgeous. Alas, they will get dirty more quickly. And before I forget: running a prototype of these shoes, Eliud Kipchoge won the Berlin Marathon in 2015 (but he had serious problem with the insoles, a feature that was later improved when he won the London Marathon in 2016).
But what happened to my Lt 3? Well, honestly I hoped to enjoy a ride with them till the end of the spring 2020, but that was definitely wishful thinking. Experts suggest to hang them up after 400 miles, I overran this threshold by more than 250 miles, covering around 1100 km (660 miles) over 1 year. The results? The mesh on the side broke, the sole was completely worn-out on the outside-lower part and partly on the central-upper part, I found out a small hole on the internal cushion of the right shoe, which was getting dramatically bigger day after day. In a nutshell: for this kind of essential, ultra-light, A1 shoes, 1000 km are really too many. It was time to replace them.
Feedback after the first 5 km run in the afternoon: the new Streak 6 fits snugly, the contact of the upper sole with the ground is particularly "soft". They are indeed heavier, and I could feel the increased cushion around the ankle. Running at a 4 m/km pace, I confirm that this version is ideal for tempo runs, but I have the impression that they are comfortable enough for 10 km and half marathon distances, too. When I increased the speed, I felt a little pain on my little fingers, due to their contact with the mesh. I experienced the same with the Lt 3: sometimes my fingers were sored (even with blisters) after 5k tempo runs. Hopefully it won't happen too often with this model.