I have a pair of the Gibbon 3 speakers that are the predecessors to the 3XL. These are front ported speakers, which may have been either a special order or a limited production. They were again upgraded by DeVore in August of 2006. They sound fantastic. In addition to being extremely balanced, they are dynamic, sparkly and very full sounding... especially for their size.
I heard the later generation of the Gibbon 3s while in NYC. Great speakers! They are definitely keepers; I wouldn't think of getting rid of them, so there's testimony for you. I've listened to them in both small rooms as well as in larger rooms with a sub.
Taking proper care for placement with these speakers really pays off. I found when I get the speaker placement just right with these DeVore monitors, they simply disappear with a generous sweet spot. They are easy to drive, as well as they do sound better with some high current power.
I'm not sure if my speakers are the same animal as the 3XL, but this is my experience with the DeVore Gibbon 3 speakers. So, I can recommend them because I have a pair.