I have watched a couple of laserdiscs earlier this year. I usually watch other things, but there are some films, and some versions of some films, that have never been released on DVD. However, every now and then they release something on DVD that used to be only on laserdisc, so the numbers of such films are shrinking. But some of them will probably never be released on DVD, due to copyright/legal issues.
Also, now that I have a larger TV, the flaws in laserdiscs are more apparent than before, so that is another consideration. If you are serious about laserdiscs, I recommend reading up on them at:
http://www.moesrealm.com/hometheater/laserdisc-guide.html
http://www.mindspring.com/~laserguru/digitalage.html
Since the video on laserdiscs is analog, the player makes a big difference on picture quality. (Just like, with analog sources, such as turntables and cassette decks, the playback device makes a big difference in sound quality.) The short version of the recommendations is, buy a Pioneer that has a stock AC-3 output and will play both sides of the disc (this will mean it was made in the 1990's and is not a bottom of the line unit). The long version, which gives more precise and accurate advice, is to read the information at the two links above, but you will not get a bad player if you just follow the short version advice (of course, I mean it will not be bad by design; any used thing can malfunction).
My first laserdisc player was a Sony made in the 1980's, and I replaced that with a Pioneer CLD-D505, which was a huge step up in picture quality. I still have that one, but I upgraded and got a Pioneer Elite CLD-79, which is a little better in picture quality, but not much.
If you have a good modern TV, you will probably be best off using the composite video output instead of the S-Video output. This is because it is combined on the disc, so the S-Video output uses a comb filter in the player, and if you have a good modern TV, you probably have a better comb filter in your TV. Try both, and see which looks better in your particular case.