I just completed half of a trade (still waiting for USPS to deliver my package to them) with @TheSliverKing and the experience has been very smooth. Communication is professional, personable, and pleasant, shipping was prompt, they packed the yo-yos very well, and shipped when they said they would. In fact, since they had no feedback here they offered to ship first before I could even ask about it.
All in all, I can highly recommend dealing with them and would not hesitate to do so in the future. Thanks!