I've been jumping Oxygn A3 for a season, and I do rate it as an exceptional helmet for RW. I think the best way to describe it is to compare it to another (and, perhaps, the only other) great choice for RW - Z1 fullface from Parasport. They're both about the same weight - i.e. very light - and give an equal amount of protection and warmth. Oxygn is way better when it comes to the field of vision - the only part of the picture it cuts out is a small bit around your nose. Every other angle is superb, which is a very important thing when you have to see what's happening 360 degrees around you. Another great advantage of Oxygn is the fact that it's extremely easy to put on/ take off. No need to press the button and tighten the string on the back, then clip the chin-strap like in Z1, just pull and tighten the velco strap on the side of the helmet (which is quite easy to access) and you're all set. This is a really nice feature when sitting in a fully loaded plane at 3000 meters, trying to get your equipment together simultaniously with 5 other guys on board. In the beginning the main drawback to me in comparison to Z1 was a bit too much air penetrating the helmet in freefall. However, I got used to it in a matter of first couple of jumps and this didn't bother me ever since, whatever the weather conditions are. Maybe someone will find it hard to get over, though. In return, however, the ventilation is great, and I've never seen my A3 fog yet. Another thing usually noted as a drawback is opening the lense. It requires more force and skill, than Z1, but with putting the entire helmet on and taking it off being that easy, there's no particular need for that anyway. Instead, I can just wait until they open the airplane door for spotting, and put my Oxygn on in the last moment, since it will take me only a second to do anyway, while folks wearing Z1 has have to put it on beforehand and get the needed amount of fresh air by flipping the visor up (which a lot of people tend to forget to close before exit occasionally). It has also been noted many times, that Oxygns have trouble with lenses opening and helmets flying off the head in freefall. Never had anything like that, and I didn't make any additional modifications to the helmet (some people use additional clippers for the velcro strap and duck-tape their visors to the helmet). I beleive the audible clip in A3 was initially made for ProTrack measurements, so it's too loose for smaller models (I use an Optima). However, they usually come with additional fixation strings, so it's not really an issue as long as you don't forget to use those. To sum it all up, I'd say in the realm of RW helmets Oxygn A3 could only be rivaled by Z1, but I personally would not trade Oxygn's ideal field of vision, ease of putting on/taking off and exceptional ventilation for Z1's easier to flip-up visor. The only additional feature I'd really like to see in Oxygn A3 is that soft-touch finish, available as an option in Z1, that does a great job of protecting the helmet from minor scratches and dents.
