I have a latex mattress, and I love it. I ordered it online.
I can't tell you if the materials about the health benefits are accurate. I was interested for some of the reasons given (sustainable, more resistant to allergens/mites, durable). I did a fair amount of reading beforehand, and some aspects seem more verifiable or likely to be true than others. There is also some labeling issues of what can be called natural vs. synthetic, where the latex is sourced from, etc. So it took some time to sort through the options and make sure I was buying what I thought I was.
I can say that it is very comfortable, and I get a great night sleep. It also does pretty well in isolating movement from other people or pets, which I appreciate.
Beyond that - I like that it doesn't need a box spring and can be placed directly on the floor or platform. I like that I bought 'layers' that allowed me to adjust firmness and make it easier to move the whole thing when need.
Be aware that it IS heavy. My biggest complaint is that I've had to move my mattress & will have to move it again (relocation). I don't typically see people selling these mattresses used (people who have them seem to like them and keep them!), and they are somewhat pricey (though durable). So moving now always includes the mattress, which isn't really the most frugal way to be relocating.