Open baffles do things box speakers don't. Of course they need extensive EQ, but one of the things you notice if you are used to box speakers is they can sound bass-shy. If you are used to open baffles, or electrostatics, of planar magnetics (Like Magnaplanar) there are no surpises. The bass is there in the right proportion to the rest of the music with no overhang, and sounds tight and fast. And open baffles interact with the room in a completely different way, exciting far fewer resonances.
Well you can buy a kit, or even buy one already built. Or you can do what I did - buy two sheets of Baltic Birch and build them from scratch. Then hot hide glue veneer them, and French polish them. Parts which are not veneered I made from a Rosewood called Cocobolo, and the feet were made from Goncalo Alves.