I finished building the TT-X68 already two weeks ago, but it was very busy, so here is my update.
Carbon quality seems really good. I had zero issues with sharp edges or anything similar. The areas for the break mounts were all sanded down really well and also with the BB and the headset I had zero play/issues. The paint quality is so far superb and I'm more than happy TanTan changed there mind on the color customization of this frame.
I use a full Ultegra DI2 Groupset incl. 160mm discs front/rear, except for the crankset. As most of you can tell, I'm using a Magene PES505 in 165mm. In combination with my Novatec R4, some RideNow TPU Tubes and the Pirelli Tires the whole bike is 7152 g. The bottle cages are still in transit, but they will add only about 25g. It's a Size 52.
For my first chinese frame experience, this was quite a good one

The only thing I do not recommend is the computer mount. I think the angle of this is too steep, but I already found an alternative.