For what it's worth, 've been running a Prism for about 6 months and had to upgrade to a Remora. The Prism started out OK, but the longer it goes, the louder it gets and less effective it seems. I've tore it down to the bare bones for a good cleaning and that doesn't seem to help out much either. Be careful of the tabs that hold the intake in. One of mine cracked and now the thing is a mess.