Energy: The oxygen doesn't give you crazy energy like a stimulant based preworkout. You could describe it as a different kind of energy I guess. It felt like I was sitting in my car ready to go but I wasn't bouncing around at all. I also didn't have that cracked out feeling in the gym where I couldn't just sit down or couldn't rest between sets because I was energized. However the energy doesn't give you any anxiety or uneasy feeling at all.
Focus: Focus with this was increased. Almost like tunnel vision towards the task at hand. I really liked this aspect of the product. On the way to the gym I was ready to excercise and didn't dread going to the gym at all while using this product pre workout. During workouts it would almost get you re-focused to go onto the next muscle group or ready for cardio.
Alertness: Also received a bit of alertness especially during the preworkout doses. The focus had me concentrating on what was going on but it felt like my brain was working more clearly to plan out how I was going to attack the workout. Thoughts were clear and the tough day at work was forgotten. It was great to be able to leave work and leave the stress of work at work. This is unusal for me.
Pumps: This claims to give pumps. I never really noticed anything special in terms of pump from this product. My legs got really pumped during their training session but it's tough to believe that the oxygen really contributed to that.
Endurance: This is where the product truly shined. I felt when I used the oxygen it helped my breathing and deep breaths felt easier. It truly felt better to be able to breath easier, not that it's hard to breath anyway, just easier. I also enjoyed the product because I was able to use it during the workout to re-energize myself to be able to push lifts that I'm usually doing and I'm already worn out. The oxygen also made the cardio a bit easier. I didn't mind doing it however I'm not at a part of my training when I'm doing long periods of cardio.
Ease of use was great with the oxygen. No powder, no pills....just spray and go. Bottle is very light so it wasn't a burden to carry around the bottle.
Cons: The worst part about the product is that it doesn't last long enough. The bottle is light enough that I wouldn't mind seeing it doubled in size because a weeks worth of workouts isn't enough. I also wouldn't mind seeing them put a mechanism on the bottle to stop spraying after each spray. Almost like a bartender with the bottle tops that pour a shot and stop. Dosing was difficult, the bottle lasted 6 workouts and is supposed to last 10 workouts, so obviously just spraying what you think is a dose isn't always correct.