Hi Shermer,
It would depend to some degree on what you mean by quality and on the person as well but for most people it wouldn’t be as much of a quality/durability issue (as long as the polyfoam was good quality and you weren’t “going through” the comfort layers too much based on weight or sleeping position) or a health or safety issue (as long as the polyfoam was certified for harmful substances and VOC’s) but more of a performance issue or budget issue. There is more about the difference between a latex/polyfoam hybrid and an all latex mattress in post #2 here.
There are also some people who may prefer all latex just because it’s a more natural material or because the OekoTex certification that is usually used for latex (for harmful substances and VOC’s) is a little more stringent than the CertiPur certification that is usually used for polyfoam and memory foam.
Most of all though … congratulations on your new mattress … I think you made a great choice 
Phoenix