Whoo! Tent looks very well. Another killer grow going on.
I have a 4" and an 6" ACI filter. They definitely work decently. I think the 4" didn't have enough area or dwell time however the 6" performed well. I still have both of them exhausting into a large home made scrubber bucket just as a precaution.
The price and the fit/finish are great. If you just need a little reduction they should do the trick for you. We live in a nice development with decent space between houses but have some very very nosy neighbors, tee totalers, and holy rollers. I had to rig the larger scrubbers just as a precaution. I'm fortunately old and codger-y enough looking to join in their complaints about the "pot smoking kids" who hang around occasionally.