Having bought both new and used, I'm sticking to new sets in the future. I totally understand the point on saving money and not dealing with the depreciation of opening a set, but I've found they are more work. With used sets you usually have to deal with cleaning them, making sure none of the bricks are damaged (Sets that have sat assembled for long periods of time loose some of their holding strength due to creep, bricks crack, etc), and I have found that 90% of the people who apply stickers have abysmal placement accuracy and standards. I think that the feeling of opening those fresh bags and applying stickers so they are square on the piece they sit on (and not at a 30° angle and hanging over the edge), and putting together fresh bricks is worth the extra money for my personal collection.