Hi rka629,
Welcome to the Mattress Forum! 
Whether or not you personally prefer it, wool is a great material that is a strong preference for some people and there are certainly some good benefits to sleeping on wool, but it will be different and firmer than sleeping on a soft foam material (and it will also get a little firmer as it compresses over time).
The type of breed used for the raw wool and the thickness and resilience of the wool fibers, the compression of the wool batts, the tufting or quilting of the topper, and the overall construction and layering of the topper along with the amount of wool inside will all affect the feel and performance of the wool topper so I would suggest a conversation with any retailer or manufacturer to talk about a specific topper when you aren’t familiar with a specific wool topper or with wool toppers as a whole.
Wool is a great material and with the right construction can provide some cushioning to pressure points, add to humidity control and temperature regulation, and is a less risky choice for alignment issues (because you won’t sink into it as unevenly as foam materials). It can also reduce the amount that your pressure points sink into the layers below it (which can be a plus or a minus depending on circumstances). For most people it would “soften” firm latex below it and it would “firm up” soft latex below it. Adding a wool topper is not like adding a plush piece of latex – it tends to be more “medium” in comparison.
Of course depending on the thickness of the wool layer it would change the feel of the mattress and you would feel less of the properties of the layers below and more of the properties of the wool itself. It can also lower the resilience of the mattress surface (wool is a resilient fiber but it is less resilient than most foams). It can also even out the surface of a mattress which has some soft spots to some degree because it will increase the surface area around the pressure points which can help them sink in a little less.
Natural fibers like wool though won’t be as soft as softer foams and will compress about 30% over time (this is a natural process with fibers and not a defect) which creates a tendency to become firmer over time rather than become softer like foam layers. At first the compression may result in impressions but by sleeping on different parts of the topper over time it can even out the compression of the wool (see post #3 here). Overall and in the right circumstances they can make a very good choice and some people prefer to sleep on a thicker wool topper vs any other material.
Regarding temperature, wool is among the best temperature regulating materials but I would also keep in mind that it regulates temperature in both directions (it’s used in the desert and also in cold climates because of this) so while it may not feel “cool” … it generally doesn’t feel “hot” either and it also helps to regulate moisture (which can trap heat) and reduce the perception of temperature that comes from higher humidity levels (similar to how temperatures feel cooler on less humid days than they do on more humid days).
Phoenix