I had the best of intentions to shoot some before and after video, but my Volant showed up yesterday by surprise (original ETA was Friday) and after opening the box I couldn't wait to install it.
The previous posters were right in that the instructions are weak to say the least, but anyone with reasonable mechanical ability should be able to figure it out.
As for any performance improvement, I would say that the throttle lag is greatly diminished. I'm not expecting much in overall HP gains but I'm very happy with the improvement in drivability thus far.
The sound is very close to the stock air box - until you get on it!!
I would say that this was a very good purchase and based on my experience, I would do it again and recommend it to others considering the purchase.