I'm unsure of my type. I might be an SP, I might not be, but I'll answer anyways.
I dated an ISFP for two years. We clicked easily at first due to having so much in common, but in the end we ended up becoming each other's "mirrors", reflecting each other's negative traits, which eventually lead to resentment.
But I'll admit, our dates were always fun. We easily got bored of sitting & around and doing nothing, so we always found something interesting to do when we went on dates. Our relationship was full of adventure. Sadly, it became toxic for the both of us and had to end eventually.
I think a relationship between two SP's could go well as long as there is some balance in the relationship.