Gallo Classico Subwoofers

Anyone here have any experience with them?  I'm looking to buy two small subs to compliment my Aerial 5B speakers.  This will be strictly for music in a small room (office).  I already have a little REL T3 that just cannot play low enough (-6db@30hz).  I want something fast (musical) that will blend well with the little Aerials which drop off sharply around 70hz.  The Classico is available in a 10" which is -3db@19hz or a 12 which is -3db@16hz.  My understanding is that they are some sort of transmission line enclosure which I have no experience with.  Anyone have any advice on which model to choose or should I go with something else altogether?