I'm not sold on it yet either, but I want to run with it to see how it does. I've been running no filter in carb box and through frame... which means still no filter all the way through so junk can get sucked in. This is breathable filter through cowl, so supposedly more airflow than regular filter, but now its sucking hot air from cowl. Both have their own negatives. I'll probably end up going back to the no filter through bellows/frame. Although I've read people put filters inside the bellows. I'd like to try that some day if i can find a filter that fits well with the bellows.
I still don't like that attached filter to the carb box. .