Based on our research, they have very positive customer reviews. (Appliance Connection has 4.5/5 stars on Trust Pilot, where Wayfair has 1.4/5 stars.)

Yes, we couldn't agree more regarding seller comparisons, and on the ability to compare across many dimensions. A way we think about this is that the price you are willing to pay might vary by the experience you expect to have. We have in mind something like Hipmunk's agony index. With a tool like that, users can decide how much more they would pay to avoid a possible bad experience.