Hi kisseer,
Thanks for the comments and for letting us know what you ended up deciding.
You can see some comments about this in post #2 here as well but as Shawn mentioned it’s not something that most people have any issues with and it can certainly be very helpful for a couple that have different needs or preferences.
Latex foam is very different from the dipped latex that is a more common cause of allergies (such as gloves, balloons, condoms etc) and with foamed latex most of the allergens have been washed away as part of the manufacturing process. Almost all latex allergies or sensitivities are also contact allergies and there is no contact with the latex in a mattress (unless you are assembling it). There are also type I latex allergies that are much more rare but those people that have this type of allergy generally know about it and carry an epipen. There is more in post #2 here about latex allergies and sensitivities.
There is also more about thicker latex mattresses with more layers in post #14 here but neither of you are in a weight range where you would “need” more than 9" of latex.
Most importantly though … congratulations on your new mattress
As you know I think you made a great quality/value choice and I’m looking forward to your comments and feedback when you’ve received it and have had the chance to sleep on it for a bit.
Phoenix