This mattress does not contain any harmful chemicals such as antimony or boric acid. I like the waterproof surface since it protects the mattress not only from baby leaks but also dust mites.
Personally, I prefer this mattress over similar priced foam versions. I just think it's more comfortable. I know there are great foam mattresses out there for babies. Yes, they are lighter than their spring counterparts. I guess I'm just old school and biased towards the sturdy innerspring mattresses.
Most of the reviews I have read on various baby forums are very positive. However, it is not cheap. Actually, for a 100% certified organic mattress it's a great price. I've seen organic mattresses in the mid 400s this one is in the mid 200s, so that's a big difference.
But if it's still out of your price range, take a look at these cheaper crib mattresses. You will notice the Colgate mattresses. They are among the most popular and in my option best quality mattresses that are outside of the organic category.