I’ve personally never owned a TX board, but they are highly regarded by the community for high quality on their boards, smooth GBs, & offering all kinds of other products on their site from all I have heard about them. My only experience with them is I recently ordered some springs & a USB-C cable from them. I had to order through the international link so I could get the lube with the springs & selected the untracked shipping since I didn’t need them quickly. I was thinking probably about 2 to 3 weeks for that to get to me & I think it was a week & half later I got it! Sure it’s just one order through them, but it did leave a good impression on me & I wouldn’t hesitate to order through them again. So if you do miss out on the Keycult No.2 Rev.1, I would say the TX-87 is a solid backup plan!
Only quibble I’ve ever seen with them is that they don’t use boards that run QMK, but iirc the TX87 fits an h87a just fine and with the overall build quality on their boards being what it is (based on what I’ve seen) that seems a minor quibble.