My 6 yo son got the flu last weekend, so to cheer him up, and give us something to do inside, I bought a couple of tubs. He loved the idea of 'mystery' legos, and we had a great time opening and building. One tub had old colors and one had new, but the bonus pieces were all old colors. The selection of bonus pieces was different in each tub. All-in-all not many of the extra pieces were good for castle building, but I think it was worth the money.
We had alot of fun and we built stuff only using these pieces.
jim