I've purchased from USCP wheel sets, the BMW M5 update kit (for the Fujimi M5 kit) and the Mercedes big sedan update kit (for the Tamiya 600SEL). All good. No issues, no problems.
I've e-mailed regarding their long ago proposed Mercedes 300SL Roadster trans-kit for the Tamiya Gullwing kit. I was told that it was now on the "back burner". Nuts. I hope that this isn't a very early indication of USCP being a victim of their own success.
Regarding ordering from overseas, I've learned not to count the days. It'll get here when it gets here. It always has.
On another note: USCP is one of two vendors that I purchase from that had announced they were no longer going to sell their wares on eBay. Both are selling on eBay again. Looked at as the sales conduit that it really is, one cannot seriously overlook or deny the audience that eBay brings to cottage businesses.