... well, there's the well-known description of a harpsichord! I'd suggest looking at the repertoire. If you love chorale preludes and find yourself time and time drawn back to Bach's Orgelbuechlein, don't get stuck with just a harpsichord. If you aspire to the trio sonatas, you might regret losing your pedals. If you love keyboard music that doesn't require contrasting timbres, sounds good on a harpsichord, and you're happy to eschew grand pedals and reeds that sound like motor-horns, then the harpsichord might be for you. It is a very beautiful instrument in the right hands.
About electronic organs; there are Hauptwerk recordings on YouTube that I struggle to differentiate from "real" recordings of real organs. Of course if, like me, you're a closet Luddite and like the feeling that what you are doing is mechanically opening a real pipe, with real live air, then even the best electronic set-up isn't going to be psychologically satisfying, but I do believe that for the technically minded, if they're adequately funded, there are options nowadays that are very attractive.
About whether it sounds good - which is a very personal matter. I think that organs played badly can sound quite as bad, if not worse, than a harpsichord. The problem with either instrument, compared to a piano, is how to bring life to a melody. On an organ it's possible, at first, to draw the audience's attention away from a lack of musical life in the melody, a lack of dynamics, by snazzy registrations and possibly a bit of swell-pedal manipulation, but in the long run, this is all rather superficial. Sooner or later any organist has to learn to use articulation to the full, with sensitivity, if he/she is to play in an appealing and musical manner. The harpsichordist has less to hide behind when they first start, so it's possible to argue that it's a harder instrument - but the argument isn't really true. Both instruments have the same fundamental challenge of how to make the music musical when you haven't got a piano's completely amazing dynamic touch, and personally I think students should tackle it from the outset.