I asked wheeltop about this (early March 2024) and they said that due to distribution and patent issues the EDS TX group is currently only available in Europe.  There's a list of places they ship to, but not the United States or Canada at the moment.

I'm trying to retrofit an electronic system onto a rim-brake frame with Shimano cassette so if I could get it this groupset would be a perfect solution for me.

I bought a set (rim brake) from...elsewhere, since Wheeltop doesn't sell to where I am.  I have two edx ox sets (older, removable batteries) that have seen some abuse off road and that recommended eds tx to me.  I don't worry too much about being able to return parts -- in over 30 years of cycling, the stuff I've had fail has been less "I need to return it to get it warrantied and back on the bike" and more "this has failed in a way that reveals it sucks and I don't want it anymore".  But to me that's the downside: no way is anyone servicing this stuff, and I had to order from a place that seemed legit but who knows.  And, you have to work through figuring it out for yourself.    I used this video:



Have used various MTB grouops, Shimano (Ultegra and DA, including Di2, Campy (couple generations of mechanical Chorus), and Sram (lately Force wireless, mech groups before that).  Using those as a reference, this group feels solid and well made.  The shifting is snappy, spot on.  It's probably not quite as fast as Di2 but rear is faster than Force.  Front shifting puts SRAM to shame and is much easier than SRAM to set up besides (I'm running Ultegra cassette, chain, cranks).  Setup is easy (basically the video above, plus limit screws).  The hoods are well shaped and offer some comfortable hand positions.  Battery sat around for a week, fiddled around for a long time installing/tuning/test riding, then went for a 3.5 hour ride and it reports 95% remaining in front and 80% remaining in rear.  I swapped the buttons for rear shifting because it felt more correct to have the big paddle shift to a harder gear (SRAM righthand functionality I'm used to) and this was easily done on the road with the app.  Buttons are a little stiffer than SRAM or Shimano but worked well enough in long-finger gloves.

So far so good.  I'm hoping this gets me a few more years on a frame/fork/wheels that are fine, just a little out of date.