For those unfamiliar with Lobste.rs, it's a smaller, slower-moving, mostly-tech-focused forum. It has many low-level hackers and CompSci people, too. So, we have more in-depth submissions on those topics. They also might survive on the front page longer just due to less competition for it like HN has. Occasionally, we also have highly-educational comments from those people that I don't see elsewhere. I always compare comment sections of anything on both HN and Lobsters to spot that. There's also some folks that just don't like really-big, fast-moving sites. They submit exclusively to smaller communities like Lobste.rs.

So, those are the main benefits of the site for anyone interested.