The biggest downside on stone pines is that you'll be stuck with two types of foliage for ever.
If you want single needles and blue foliage, colorado spruce is nice.
If you want double needles and blue foliage, scots pine will work.
If you want double needles, blue foliage and a double flush, look for glauca varieties of JRP.
If you want Mediterranean pines, go for halepensis. They stick with the blue needles too for some time, but they don't revert as easily.
Every pine has drawbacks and downsides, but stone pine has one of the biggest flaws aesthetically and practically speaking: you can't predict how it will behave and even if you do, you'd have to make the choice to stick with one of both types of foliage. I've spent a couple days looking into it, I had one too. If you think you can pull it off, be my guest.