I've tested the Squeak 64-bit Linux HT version on Ubuntu 14.04 and
16.04.  I've put it through several paces and it's been quite stable
for me.  My apps pass their tests and seem to be running at least as
well as before.  Debugging is a dream.  It just works.  Performance
still feels snappy, but I didn't do any benchmarks against
201608171728.  Looks like yesterday was the old VM's two-year
annniversary.

It seems good enough that I've upgraded to it everywhere.

64-bit Squeak with a mature VM is finally a reality!  What an
incredible engine, congratulations Eliot!

Cheers!
  Chris