If you are interested in LX, make sure to look throw each and every paragraph of this site:
http://www.mir.com.my/rb/photography/hardwares/classics/pentaxlx/index.htm
There are a lot other LX dedicated websites too, but this site is so far the most comprehensive one imo.
To sum it up, LX is the first and probably the only professional 135mm film SLR camera Pentax ever made, it's not just a camera, but a full scale system camera aimed directly at the professional market. It's the most compact, and probably the only weather sealed manual SLR film camera, it has a revolutionary IDM Light Measuring System for a theoretical perfect automatic exposure. Its Integrated Direct Metering ("IDM" in short, they called it) system offers the photographers with extremely accurate, instantaneous automatic exposure readings from as low as
125 sec to 1/2000 sec, both in available light and in the TTL Auto Flash mode. All these have enabled the Pentax LX to truly recognized as one of the modern classic SLR camera of modern times. Even modern dSLR camera can't meter correctly under such dark environment.
Pentax also made a lot accessories for LX camera, so to make it suit for all kinds of photography needs: from interchangeable focusing screen to film winder, databack, bulk film loader, wired and wireless remote control, remote battery pack ... The list is too long to list here. Better read it yourself.
But LX isn't a perfect camera. It has its shortage too. The most well-known and annoying one is the sticky mirror problem, which happens to all LX cameras after certain period of time. The other one is the loud shutter sound, way too loud for a professional camera.
Nevertheless, LX is still my favorite film camera. As long as you can live w/ the loud shutter sound, and your copy doesnt have the sticky mirror symptom, it's really hard not to like it