I credit distrowatch for helping me find SolydXK. At the time they took debian testing as upstream. They ran on the updated packages for a few months and then,

I credit distrowatch for helping me find SolydXK. At the time they took debian testing as upstream. They ran on the updated packages for a few months and then, of stable, would release a big bundle of updates. So you were on a semi-rolling distro. They don't have enough resources to be doing this anymore - so their stable is now basically the same as debian Jessie.