There are a number of pros with ePack, such as base cards being relevant, instant and free trades, and visibility to products some collectors might otherwise ignore.
But overall the cons are so huge that they've made trading on ePack a huge, annoying chore.
Some items are overpriced and almost never see a price drop (15-16 MVP still at $2.50 US a pack, really?!?).
The site is overall very slow, especially when a new product is released.
The fact that there is no ePack app, and that the experience is EXTREMELY clunky on mobile, is even more perplexing considering their objective of reaching out to younger collectors.
And let's not even begin talking about their chat and message service, which are more reminiscent of mIRC and the Internet from the late 90s than anything else.
There's also a problem with a lot of traders treating your cards like trash (even though they want them in a trade), while treating their scrub YGs like it's the Holy Grail. The lowball offers I often receive for mid-end or high-end items - offers which to boot, usually include none of my stated interests or items from my wishlist - make me want to quit ePack entirely.
Then there's the achievements. Some of them are great, others simply do not make sense. I mean, who in their right mind, unless they had the money to waste, would redeem a complete set of UD1 for an achievement card selling for less than the Matthews YG alone?
There's also the fact that there's no point or money system to help in trades or to reward consumers.
The worst part about ePack, though, is working on big trades involving various sets, and scrolling through people's large collections in general. It...takes...FOREVER. Since, in the left-hand menu, there is no checkbox that would allow you to select multiple sets or items at the same time, you are stuck constantly going back and forth to find the items you seek. If I want to consult a collector's entire collection of, say, UD1 Shining Stars, without having to scroll through all his base cards, Foils, Canvas and so on, I have to : 1) click on the list of all inserts; 2) scroll through a list of all possible sets owned by the collector and click on SS Left Wingers; 3) look at SS LW then click back; 4) scroll down the list again to find SS Centers; 5) after consulting, clicking back again; 6) scroll down AGAIN to find SS Goalies and click on goalies. And that doesn't even include SS Royal Blue or Achievements.
This serious deficiency also affects how quickly you can do trades. If I want to trade for 100 base cards of 9 different players, there's no box that allows me to say I want X number of each base card. Instead, I have to select the set from the left-hand menu, scroll to find the card (or search for player's name), click on the card which will open another window showing me a copy for EVERY base card, and select each one individually. Then come out, scroll again to find the next player, and so on (unless taking only one copy of said base card, in which case I only have to check a box). Now imagine if I'm trading for 100 base cards from 3 different sets, and you get a clue of the headache you'll get.
Well, that's my huge rant about ePack.