Excellent autonomy, excellent functionality. For sports, especially in the open air, it is the most. Many write about the dim screen - I do not know. in the bright sun, it is probably dull, but I have never had problems with this. In the training mode, there is a good contrast - in general, the illumination is enough for me to get the necessary information. In fact, the brightness of the screen was sacrificed for the sake of autonomy and durability - after all, sapphire glass . For a year of active wear, it was not possible to scratch. For example, Suunto 7 - with a gorilla is much brighter, but the screen has been slightly rubbed over the year, but not critical. At 9 baro - not a hint of scratches. In general, for a sports device enough. We are pleased with the strength - this is a kind of armored personnel carrier among watches. On trips I don’t take it off my hand - salty, fresh water, diving, swamp, forest - I never got confused so as not to break / drown / scratch. In general, as a sports watch - there are practically no questions for them. This is the second watch from suunto - the first ones were 7. I took these because of the greater functionality and reliability. In general, I use both 7 and 9baro. Everyone has their own niche - 7 is more likely to travel (NFC, Google applications, navigation - consider a minicomputer is always in your pocket) + fitness, 9baro - more for fitness / sports, moreover, for training for results - it tracks more parameters. For athletes, nice buns in the form of strava partners and others. Special thanks for the V0max rating. This is the thing you need