umm, as far as I know, ETS does NOT make LSAT. And this will make the style of tests different. I think that's why many NN's have said that after practicing with LSAT CR we must return to GMAT.
I'm using LSAT for CR practices right now. I suppose if I run out of material for reading, I might try LSAT passages.
I support MM Vinegar. LSAT reading can be a good help if you have time. I think it's closer to GMAT than GRE reading in terms of style and topic. LSAT stresses on real understanding and logic thinking in the reading. The articles are not necessarily difficult, but the questions are trickier than those of GMAT. When you read the article, you have to fully understand the clue and the relationship among different parts, and you have to remember some details. Since you have more than half year, you can do it.