Region-based memory management

As I understand it, MLKit is entirely region-based memory management and
the
Stalin Scheme compiler uses similar techniques and this is fundamentally
different from both reference counting and mark and sweep GC.

What are the implications of this technique and how well do the compilers
perform in practice? Does it suffer from stalls or keeping values alive
too
long?

-- 
Dr Jon D Harrop, Flying Frog Consultancy
http://www.ffconsultancy.com/products/?u