Sadly it's not maintained anymore and even the intellijidea-derived decompilers are better nowadays (used to be horrible until a few years ago).

In addition to the limitation to classfiles built for Java8, it sadly has a hard time decompiling new language features even if compiled for a Java8 target. And then there is the well known bug that decompiling full jars in bulk does not get you the same output you see in the UI but orders of magnitude worse... jd was great until it lasted, helped me solve a lot of issues with verdors over the years.

The most annoying thing in intellij (fernflower is it) is that it does not maintain correct line numbers, so when debugging, there is a divergence. Still you need to download sources but not always they are available