I used to use them regularly, but then I stopped due to durability issues. I kept snapping them on slap shots, about every 3 or 4 weeks. I don't play all that often, just roller hockey 2 hours a week and im not a big player putting loads of stress on the shaft when shooting. I'm 5' 7 and I think im somewhere around the 155 pound mark, but even still, it was too much for the Octanes to take on a consistant basis. I ended up changing to an RBK 5K shaft at first and later an Innovative Novius. Never had either of these show any sign of damage (other than paintwork chipped from being slashed) so I'm fairly sure its not just down to my technique, although that may have played a part.
In regards to the Octane, it does have some advantages. They are very cheap and easy to replace, they are light and they will give you good performance on your shots, for as long as they last. Even though I broke a few of them, I'm glad I bought them because when it came time to buy something different, I went with shafts with a softer flex thanks to playing with an Octane, as opposed to stiffer shafts I had previously been using. I'd recommend them if you aren't very big/strong as you will likely get decent durability from it. Or if you don't mind spending a small amount on a shaft more regularly, then again it could be a good purchase. But if you have an already powerful shot, want something durable (I never had one long enough to find out if it would last well in game situations) or want really top notch performance from a stick, spend a bit extra on something else. If you want a recommendation on something still affordable, I think the 5K is great value for money. Had it over a year and never had a problem with it. Other people who have borrowed it have enjoyed using it too. I'd highly recommend the Novius too if they were still (widely) available. I love my 300 flex Inno, but now they are Warrior, I'm gonna have to check out the Dolomite shafts at some point. The 75 flex sounds interesting. If the 75 has the same durability as I am accustomed to with Inno, then that is going to be one hell of a stick.
Anyways, hope thats of some help.