Two AoA questions- terrain quality, unit complexity

For those who have received their AoA sets, what is the quality of the terrain? Is it sturdy and easy to use?

Also, I haven't ever played Heroscape, and I'm debating between AoA Master Set, the Wellspring Battle Box, or a used Rise of the Valkyrie Master Set. Which would be the most fun for me to play with my almost 8 year old son? Are the new units and rules more complex than the original?

Thanks in advance!