Star Trek Online's first expansion, there's good news to be had -- you just got more for your $125 investment. For one thing, you've got access to a new ship, the Haakona Advanced Warbird, an assault craft capable of separating into two units for maximum versatility. For another, you've got a set of uniforms based off of the Romulan outfits from the original series, if you want to really hit that "legacy" button as hard as you can.
Whether or not this entices you to drop some additional money, the latest development blog on the official site details the bonuses for slotting Romulan refit consoles together in Legacy of Romulus. These include buffs to turn rate, energy weapons, and defensive systems based on speed. The net result is that owners of both refit and retrofit versions of these vessels can access a new playstyle for the class, a new trick to surprise opponents of the Romulans. Which is apropos.