Hi ford1953jimth,
It is certainly a good quality and value topper and in general would make a good topper on top of an extra firm mattress for many people.
You can see the topper guidelines I use in post #8 here. If you are looking for a topper that would provide a fair bit to a lot of extra softness and pressure relief (especially on your side) compared to your mattress alone, and if you are comfortable with and prefer the slightly firmer and denser feel and slightly greater secondary support (the kind of support that fills in the gaps of your sleeping profile) of Dunlop compared to a similar ILD of Talalay, then this would make a very good choice IMO.
Phoenix