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It has very good sound but its bass is not of good quality, it seems to deepen the sound rather than enhance it. Also, if the battery drops below 80%, it lowers the volume and I spent an hour the other day trying to figure out what was wrong. It's a shame because it is a brand name. Get something else.

Today I threw them away, they lasted 1 year and 3 months. Cheap? Cheap! But this is the second time the brand has disappointed me and I will no longer buy Nike, let another company take my money.

At first I was excited about the writing and comfort, but their tips, when looked at crookedly, stop writing or write intermittently, from the set of 10 pieces not even one finished their ink, they all had some "issues".
I will try the Pilot G2 which are apparently the top in the Gel category.
EDIT: I tried them, much better writing by far, and they also have a button.

I was disappointed with this agenda, although the quality of materials is good, its usefulness is despairing, as shown in the photos the diary is like an insert and goes back and forth when you open it and try to write, because it is an insert and not fixed it is not usable and the elastic band that I want to hold certain pages.
Also, the pen is so hidden at the back that not only does it not come out easily, you have to move the insert to put your fingers inside to pull it out. Also, the loop is so wide that the pen moves under the agenda and creates a bulge. Pleasant surprise that the pen has a capacitive tip on the other side to use it as a stylus on a mobile/tablet.
Overall, it doesn't suit me at all for the use I want, to quickly open and close it and take notes. It's a shame because it looked very good in the packshots.

According to the application instructions, the size that fits me is small, but this size ultimately presses on my nose, slightly closing the airflow, which is very important.
I bought the large one and I really have a perfect fit with the large one, but... I used it for two nights and had terrible leaks. On the third night, I didn't even try, I went back to my old Sefam and slept like a human.