I have GP5000S and GP5000AS on Edges, no problem with mounting, it's quite easy, actually.

Were they the tubeless or tubeless-ready versions?

I just want to also confirm that I've found the TR GP5000 to be quite stiff, definitely more difficult than the clincher versions.

also got mine from lidl. Works absolutly fine for 35€

The Lidl repair stand is also sold in the US, but only during "bike month" specials. Got mine a couple years ago but saw that they sold it special for $35 during April the year after. Also a good time to buy Crivit bibs. I use them near daily for my indoor trainer, good fit once "broken in".

Finalised my part purchases for a build. Only needed to buy a seat and tyres locally. The savings are immense. There's something very wrong and out of control when for the price of a new bicycle, you could have got a 890cc Yamaha. It ain't our problem retailers, importers etc cannot get their suppliers to manage their costs.

I agree this seems out of whack. The two highest cost items on the bike are the groupset and frame, to me everything else is almost down to commodity pricing. I can see the argument that frame makers are relying on--they spend money for the research in design, materials testing, and prototyping and should recoup some of those costs. Which is why open frames are so nice--we don't need the most cutting edge, only the tried and true. But the groupset costs to me are clearly due to monopoly--Ultegra and 105 has been around for how long? Sh***o has long-term patents and simple things like the axle diameter can't be touched by other crankset makers. Or is it not the patents and that these items are truly very technically difficult to make?