Product review (4 stars): So far a good replacement for pur filters...
I have Whirlpool french door fridge and usually use the PUR filter#4, but decided to give this a try instead.

I purchased one unit this morning with same day shipping ($6)
I literally drink so much water that i couldn't wait 2 days with prime shipping.
Total = ~$20 (still 33.33% cheaper than pur)

In comparison the filter is a bit slimmer and the inner mechanisms look a little different (Pur is on the left, EcoAqua is on the right) so I was a little hesitant.

But it seems to work just fine!
I'll update if I notice any major differences.