Product review (5 stars): Works as advertised; I'll be a repeat buyer
In summary, it's been a satisfying experience.  Good installation instructions accompany the product.  I didn't leave the factory filter in service for much longer than directed, so it came out easily, without stickiness from a seal left in place too long.  The replacement went in easily.  The initial 2 gallon flush produces some pretty black water, but it clears within a half gallon.  No leaks.  The company sent an email when the product was delivered, an an effort to pro-actively prevent dissatisfaction (and thus bad ratings); it was mostly a reiteration of the printed instructions in the box, with a couple extra FAQs thrown in.  Since my experience was problem-free, that email felt redundant, but I'd probably have appreciated it had things not gone so smoothly.  I bought a single filter this time as I was unsure of the product, but future purchases will be a multipack.