Pulled FTBUtilities from github to test it out before the pack launches and it's awesome! But I've gotta say, it's really not ready. I'm hoping it's just because the version on github isn't updated. It seems cool as hell, and everyone I've shown it to is super excited about it, mainly the friends system and chunk claiming, especially that client UI, everyone loves it.
Until we started tesing it... I get the point of it, to have a uniform mod which people can join onto an FTB server and instantly know how to do various functions instead of having to go look up the wiki of whatever fork of a fork of a plugin the server is using, but right now it's not a replacement for a lot of bukkit claim plugins when using cauldron and it's definitely not a replacement for forge-specific claim like MyTown2. Even mods which are protection-friendly, ie implementing forge events and fake players, will still sail straight through FTBUtilities because it's not checking block events, only playerinteractevent and fake players are specifically excluded from any checks.
It has so much potential it really does and I love the concept but in it's current form it's only going to be useful for whitelist servers and players are going to be very disappointed when their fav big servers either don't use FTBU claiming abilities or start banning more items than they have to because FTBU doesn't handle them. It's just not ready.
On the bright side though, I wouldn't be surprised if some of the forge protection mods like MyTown2 hijack the GUI from FTBU for claiming and just bypass the issue altogether.