I got my Tx3 Mini from the same seller, 3 months back.
I was a newbie to Android Boxes then, and this seller gave me the best service before any purchase. Ask any thing, and replies almost immediately. And the seller seems to work till midnight.
After sales service is even better....lol.
I was attracted to the ratings and comments from previous buyers before me, and it seems 3 months later.. .. the seller is still doing great just by looking at the feedback of recent buyers of this product and other top selling products from the seller..

recently i have upgraded to uhd hdr tv, but tv native player can handle 4k hevc hdr, got built-in astro go, and netflix 4k. no need upgrade to minix u-9h...so still stay with u1...money saved. haha