No specific info about version 2.8. Please visit the main page of UnRarX on Mac Informer.
The main advantage is that the app is extremely simple. You won't be able to compress an archive or decompress other formats than RAR. Thus it seems to me not very functional for every day use.
Zipeg is a lightweight application for managing archive files.
RAR Expander extracts the files contained in RAR archives.
Best Mac archiving tool to preview, compress and decompress Zip, 7z, Rar files
Designed to help you extract the contents of RAR archives.
Mount ZIP and RAR archive files as disk images on Mac.
The main advantage is that the app is extremely simple. You won't be able to compress an archive or decompress other formats than RAR. Thus it seems to me not very functional for every day use.