I've got one big Sweet Scarlet goumi bush I planted, and a handful of others started from seed. I'd go for a variety that has larger fruits since the seed is already large. Layering worked for propagation. I haven't seen it try to spread, which is nice. I do a lot of pruning on it every year to keep it smaller and make it look nice. Otherwise it tends to fill in densely. There are some large thorns, but they're easy to avoid. The fruiting wood seems to be ready for renewal after 3-5 years, since fruit set has declined over the last few seasons. Flowers have a nice vanilla perfume, and last for a while, starting out white then turning more beige. Fruit seems to be best for fresh eating. It can be hard to tell when it's ripe and under-ripe fruit can be astringent or tart. The fruit turned an opaque pink when I tried to make jam, and it wasn't very appetizing. Birds don't go after them here, but I've seen ants eating them.

That's my brain dump on goumi.