I'm certainly no expert on the species, but I will share my experience. I ordered from Oscar last year, and the seeds arrived quick, and I planted them. There was some issue with my weather I think, but I managed 2 sprouts ... one was clearly a super plant, because it grew so fast. I repotted it, and it grew even more, starting to branch even. It grew to about a foot or maybe more or less by Winter and it remained healthy and vibrant. Sadly, it defoliated and I think died, but, here's the important part. It deteriorated, not because of my growing conditions, but it got infested with scale somehow(scale is a serious problem in my garden), and succumbed to the damage ... I tried my best to remove all the scale, and took the leaves off, but I think it was too late. I keep it in case it sprouts from the bottom ...
So, I had to put in another order.
It's a pretty plant, and not more difficult to grow than a Longan ... keep an eye on pests though.