Deciduous, but the wood is kinda purpleish-brown, so it's not boring in winter.

Prunus cistena is also a Japanese beetle magnet.

I will sure ditto the japanese beetle issue, and add that they have other problems, as well. When I think of this little tree, warning flags pop up in my head.

They are VERY pretty for a short time in the spring, that's for certain.

Here is a link that might be useful: Prunus x cistena