It's a Kelsall design, which is good. he knows how to draw a tri.
It is a swingwing trimaran, which is also good- easier to trailer, easier to set up, cheaper slip fees if you plan to keep it in the water.
Trimarans are a different beast- less heel and more speed than a similarly size mono, usually.
it's not a real attractive design, wasn't a huge seller when new, and being older and virtually unknown, they aren't a real valuable boat. $2500 including trailer sounds about right.
The spots to watch out are the mounting points for the ama outrigger arms- they get a lot of stress, and are an easy place for water intrusion. if the core is punky here, prepare for a lot of work right now- you don't want to go sailing with one of these with arms that may pull free of the aka in any sort of chop.
If you can, swing out the amas and give them a bit of a wiggle- if there is a lot of flexing and pulling at the hull, expect to get in there and at the very least bond in beefier backing plates. It's not tough work, but it is dirty and unfun, if you are expecting to go sailing right now.
Check it out, and follow the "inspection trip tips" outlined here at the top of the page. Save a survey for later- do an initial inspection and if it looks good and feels good, go with your gut.