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I don't mean to make this sound negative, but with both IBF and PHPBB modules, they make core changes to the XOOPS files, my only concern is that when Xoops.org upgrade there scripts, you will need to wait for the dev of these modules to upgrade his modules, especialy if you are inexperianced with php.
Although these modules are great, and the Developer has done a wounderful Job, you have to take this into account and bare this in mind, especialy if Xoops.org Dev's make a major Security updates, you will be left waiting until the mods are updated before upgrading your security.
This is another concern of mine with core hacks.
Sorry about this, but I feel it is something people should be aware of first.