I have read a few opinions of the Supreme Court over the years. I have no specific background in law, and I am not even a native English speaker, but I have found them uniformly accessible to a layman. They use a dozen or so boilerplate latin expressions that you need to get used to, but they are otherwise fairly readable.
The leaked text by Mr. Alito is a masterpiece of English prose and scholarship, in my opinion. In 90 pages or so, it explains the history of the issue and the legal theories that common-law judges have advanced since the 14th century. It analyzes the arguments in favor and against Roe and Wade. It also summarizes the legal handling of the issue in various US states.
Irrespective of whether or not you agree with the conclusion, these opinions are one of the few pieces of contemporary literature worth reading. I myself am looking forward to the final form of this text (should the Court decide to uphold it) as well as all the dissenting opinions, which I expect to be of similarly high caliber.