I've got mixed feelings about ePack.
On the downside - holy cow their site sucks today. It was always pretty slow, but with the release of Compendium S2 it is practically unusable right now. In my day job I build online servers that support some of the biggest video games in the world, I know it's not a trivial task to design services that scale or load test them properly, but man the performance of the ePack site at present is downright embarrassing.
Even when the ePack site is only "normal slow" and not "#@!&*ing slow", it's still a pain to use. If you need 310 Compendium base cards of your player to finish the gold rainbow, your options are either constantly spam the forums trying to find someone to trade with you, or very tediously proposing trades 1 at a time to the hundreds of people who have a copy.
On the plus side, compared to physical box breaking, there are probably a lot of cards out there that someone is just dying to add to their PC, but never get listed as the effort to scan and post cards on ebay leads to a lot of cards just languishing in basements. When everything is available, and there's no friction from ebay fees, shipping fees, etc., it's feasible to make trades that just wouldn't happen otherwise.
Ultimately I think it will succeed or fail based on how much of a social platform it becomes. They could certainly improve the tooling to automate things to the point where you could say "I want 300 Sedin compendium base, auto-accept any trades for scrubs through to stars at 1:1, or 3 Sedins for a Toews, 5 for a McDavid" or something along those lines, and then you just click buy to purchase enough trade bait boxes, and watch the Sedins roll in, but I'm not sure many people would see the fun in that. I think they need to grow their community features beyond the utterly primitive Sports and Entertainment forums that they have now.
