This adventure brings a lot of fun in oldfashioned fantasy gaming. I find it perfect as a spoiler in some bigger campaign. But it can be start up for campaing itself.
I love idea of Root Walkers. And idea of tower in the cave, I love even more. They refresh my memory with some old AD&D glimpses.
Only "but" is some linear construction of this module. But Rot & Ruin provides so much good gamin' experience, that it is easy to forget about linear plot.