My main machine is running Slackware64-current. I do most of TDE relevant development
there.
Ray-V's slackbuilds are stable and work really well, occasional bugs notwithstanding,
but some apps might not have slackbuilds (it's not a "package everything"
approach).
I actually have a slackbuild generator script I use for building apps not in Ray-V's
slackbuild collection and for development purposes. If there is interest I could publish
it somewhere (probably on my Github). It is somewhat hacky but works well enough for most
purposes (just not core packages, Ray-V's slackbuilds are just better).
--
Philippe