Hi Braphie,
Their site is back up it seems.
Whether there are “negatives” or “positives” depends on what you are comparing it to. If you are comparing a latex hybrid to an all latex mattress for example you can see a comparison here.
On the latex hybrid mattresses on their own site … each of their 3 hybrid models has a different benefit as you go up the line. The Cotton Camilla is the basic model (similar to the Eurotop on the Amazon site). The cover has wool in the second model up (Bamboo Bliss) and there are two layers of latex that can be customized in the third (Aloe Alexis). One benefit of having latex on top is that the top layers are generally the “weak link” of a mattress and this way you have the most durable material in the layer where durability is most important.
I think you can return it to Ikea but they could tell you for sure. My thoughts about it are in the last reply.
I designed my own mattress and had it built to my specs so it wouldn’t be available for someone else to purchase anyway. You can see the details here.
Phoenix