First thing is to make sure the electronics are the proper voltage/frequency. China is 220V/50Hz. Also they must be properly fused for the US market.
As far as shipping/customs, I haven't had any issues, as they usually send it direct. But I mostly buy small value items from China (mainly LED's).
The one problem I did have relates to the first paragraph above. I bought a Tube Integrated amp from China that blew the fuse as soon as I turned it on. Even though the transformer was dual-voltage (110 or 220V), the fuse wasn't changed. It had a 2A fuse. When you halve the voltage , you double the current. So I put a 5A fuse (should have been 4A), and it worked.
As far as shipping/customs, I haven't had any issues, as they usually send it direct. But I mostly buy small value items from China (mainly LED's).
The one problem I did have relates to the first paragraph above. I bought a Tube Integrated amp from China that blew the fuse as soon as I turned it on. Even though the transformer was dual-voltage (110 or 220V), the fuse wasn't changed. It had a 2A fuse. When you halve the voltage , you double the current. So I put a 5A fuse (should have been 4A), and it worked.