Got mine today from urban junkie. One side is really very sharp (left) with full detail. Right side is a little more blurry, couldn't make out a card unlike the left. Of course this could just be my eyes, I do wear contacts though...
All in all rather pleased!
Edit: Found the problem, and its not my eyes. If you look at the pair you've bought from the point of view that you view through, and then flat on as if the lenses were on the table then you can see whether the lenses are flush with the casing. My left side is, and is crystal clear. My right side however is not, and is thus blurry. I suggest you check yours to see if this is what is causing the bluriness. You really ought to be able to make out fine details with these (I can on the left side).
Main problem is that the lens casing is non adjustable. Will keep trying though!
Edit Edit: Given up. The frames are not adjustable, and I guess I can live with it. Left side is v sharp, enough for card spotting. Right side is sufficient for object distinguishing, just not detail of the card.