Hi yuppicide,
You certainly made a great quality/value choice and there are no lower quality materials or weak links that would compromise the durability or useful life of the mattress relative to your weight range … so congratulations on your new mattress 
I think that’s a great idea because when you are purchasing a mattress that you haven’t tested in person then a more detailed conversation with the retailer or manufacturer and the guidance they can provide is one of the most important parts of a purchase.
I wonder what a cloud really feels like?
These are just words and the “feel” of a mattress is subjective and relative to the person … not some review site that just takes an 'average" of other people’s opinions and presents them as fact. There is more about the difference between memory foam and latex in post #2 here but the only way to know which one feels more “cloud like” to you (and the firmness that would feel more cloud like because memory foam and latex mattresses both come in a wide range of firmness levels) will be based on your own personal experience.
The last inch is the quilted cover.
I’m looking forward to your comments and feedback once you’ve received it and have had the chance to sleep on it for a bit.
Phoenix