instinctively i would say a load more button would sell more than infinite scroll since it limits the information shown to the user, which mean he's more likely to act (e.g. less "paralysis by analysis")
Actually if analysis was quick enough, I’d prefer to see all items at once.
But what they do is re-xhr on every filter click, making it impossible. What’s wrong with just loading a big json of all items in a given group and allow me to sort/filter/compare quickly to find good ones? Their funny “web 2.0 framework” is at least 5 times heavier than the entire product base gzipped, and still uses web 1.0 style to operate. The only 2.0 thing about that is how flipping quick their backend paralyzes their clients.
I wonder if this is motivated by product reasons, or if it's done to solve technical problems.