Congratulations on your new purchase!
I’m glad that you are happy with it so far!
It is good to keep in mind that while horsehair is certainly a great material and is more resilient and “springy” than other natural fibers it will still tend to compress a bit over time and at one point you may wish to flip the toper and/or the reversible spring mattress of your sleep system and periodically “massage” the mattress.
A two sided mattress that is rotated and flipped on a regular basis (see post #2 here) will certainly last longer than a one sided mattress that uses the same comfort layers on only one side of the innerspring (even with very durable materials such as horsehair) because for half the time the comfort layers on the bottom of the mattress aren’t subject to the same amount of compression forces that soften and break down the materials over time as the upper layers in the mattress.
I’m looking forward to your updates after you’ve had a chance to adjust to your new mattress and sleep upon it for a while longer.
Phoenix