Issues I've found so far:
* Regardless if I'm a premium user or not, I can move cards to the Scratch Pad (which, I assume is supposed to mimic TappedOut's "Maybeboard", which is an awesome feature I've thought Deckbox has needed for a while), but once they've moved, I can't see them to move back. I would think that I either shouldn't get the option of moving cards to the Scratch Pad if I'm not a premium user, or maybe some sort of alert that tells me "Once you've moved these to the Scratch Pad, they're there forever or until you're a premium member"
* Search Filtering
** Cost - I have options for Equal, Less than, Greater than. Didn't realize that if I wanted CMC of 3 or less to pick Less Than and set to 3. Might want to condense that to be something like, "<=", ">=", "==", etc., just to be slightly clearer.
** To go along with cost, if I search for something that's say, 3 CMC or less, it will actually pull up things like Beseech the Queen, which is actually a 6 CMC cost, not 3.
To throw my hat in to the "great 4.0 debacle" as some seem to think, I'd absolutely do a month-to-month $5. Hell, I'm doing that with PucaTrade now and I never use it anymore (which just caused me to realize this, and stopped that, so now I'm going to have $5 more a month to send). $7 seems just out of reach, $2 seems like not enough. That's just my opinion, though. Maybe some sort of tiered system, $2 gives you X features, $5 gives you XY features, $7 gives you XYZ features.
My gut reaction, initially, was absolutely "They're charging for features I already have now? Nope, I'm out." After taking some time, thinking about it, dealing with family items and such, I totally get where you're coming from, and absolutely respect your stance. I'm all for you getting something in return for your time and effort, and would happily contribute, but I think $7 is just a bit more than I'm willing to pay for the features at this time. If a feature or something comes along that I have to have, I would absolutely not hesitate to jump into the premium pool, though.