If you have any MODs, that will be a pain in the ... It´s my case too. I´m responsible for a site/forum that is still on 3.0 and we have a bunch of MODs installed. The most significant barrier that prevents us to move foward is phpbb-seo MOD/Extension that currently is incompatible with 3.2 and the project seems abandonedI hope that it would not be problem to upgrade from 3.0 to 3.2 version.