This review is written by someone who already owns another nature pack (swamp forest). The differences between the packs not as much as I would have wanted. Effectively they use the same objects, with minor differences when it comes to coloration and dressing (e.g. cobwebs).
In the case of the haunted forest, this amounts to cobwebs in trees, which is a plus, but there wasn't the variety that I'd hoped for.

If you're only buying one pack, then I think these are very reasonable resources. You get a fine assortment of rocks, trees, shrubs, etc -- which, by iteself is worth the price. There are some really pleasing trees which lend themselves narratives. However, If you're thinking of buying multiple packs, perhaps you should curb your enthusiasm... unless the publisher determines some discount policy for owners of more than one set -- appreciating the redundancy of many elements.