AC Infinity makes high quality products. I have a few other products from them including a grow tent, inline fan, fireplace fan, media cabinet fans, and now this refillable carbon filter. I haven't had a problem with any of their products and they are all much better quality than their competitors.
I'm honestly a bit surprised that this is the first refillable carbon filter, at least that I've found. It just makes so much more sense to be able to dump and refill the carbon rather than throw aw...