Nested Intervals

Has anyone used or seen use of Nested Intervals (see
http://www.sigmod.org/sigmod/record/issues/0506/p47-article-tropashko.pdf)
in Ruby on Rails? I need something like Nested Sets but also need
something that can handle very frequent repositioning, adding and
deleting. The problem with Nested Sets is they're way to heavy for
updates.

Just curious of any success stories or insight I can get on this.