Okay, so I've been using these Simply filters for about two months now and WOW - what a difference! As someone who sneezes just looking at dust, these have been a game-changer.
The installation was stupid easy. Like, 'why-did-I-ever-pay-extra-for-that-fancy-brand' easy. They slid right into my AC unit without any wrestling matches (we've all been there with ill-fitting filters).
Air quality improvement? Massive. I actually stopped taking my allergy meds for a week just to test (don't tell my doctor) and... nothing. No sneezing fits, no itchy eyes. My apartment used to get dusty after like three days - now it stays clean for weeks.
Pro tip: The slight size difference mentioned in some reviews? Total non-issue once your system turns on. Yeah you might hear a tiny 'clunk' but it's way better than paying double for brand names that do the same job.
Six filters for this price is insane value. I'm set for like... math... a year and half? Definitely buying again when I run out.