I'm running R14.1.5~[DEVELOPMENT] here entirely happily. As a habit I don't run deep-in-the-woods versions, nor the urban tenement release versions, but the in-between, nice-place-in-the-suburbs-with-a-tree-lined-yard almost-ready versions of both Debian and TDE. As a result, a new release is pretty much already on my machine when it is released. And everything just works, with the exception of the desktop crashing at launch occasionally. (Everything works even then, just no wallpaper of the sort that has caused so much consternation -- solution: use a different wallpaper if wallpaper is your thing -- or in my case xplanet with realtime moon image, and no rmb menu on the desktop.) Logging out and back in usually fixes even that, which I think may be a dispute with Enlightenment, which I also keep on the machine.
I should note that during the development of 14.1.5 I've gotten the worls in progress and none of them has been troublesome, so the developers are really good about catching things before they get into the wild. A side benefit, both is Debian and in TDE is that using the not-quite-ready version means that version upgrades are non-events, because I do update-upgrade at least once a week.
Then again, I don't have multiple virtual desktops, just two monitors that are seen by XRandR as one 1920x2160 desktop. This could be due to my high-tech, modern, NVidia GeForce GT 1030 vid card and incredible AMD FX-8350 chip that I've only had for I think 11 years.
But now I see here that I must worry about a wallpaper that apparently resides somewhere on this machine that it appears someone doesn't like. Because it makes me have to think back and try to remember if I have ever, even once since the July 1998 release of KDE-1.0, I've ever used a wallpaper at all, and except for a screenshot for Practical KDE in 1999 I don't think I have.
All of which is to say, Thanks, devs! You do great work. Damn near flawless in my experience!