Been thinking about this promo a bit today. IMO, it's beyond overrated. In terms of piece count, I'm no expert but seems to be smaller than this one for comparison
So maybe a total of 150-175 pieces.
In terms of appeal - this is subjective - but to me, its just a generic castle. low key cute at best but really nothing special.
But most of all, 12,500 seems like a ginormous number for this type of thing. If it was 1k, I'd be all over it. With 12.5k, I have a hard time believing this will even sell out by the 24th. I'd bet confidently that there will be a large surplus, in the thousands, that are not "redeemed". These may very well show up on walmart.com for 9.99 in a week or 2. Alternatively, they may keep this promo running indefinitely.