I've used Onyx for several years without a single problem. Don't get me wrong, if you are a novice, or careless or simply push buttons without knowing what they do, I'm certain that you can damage your system, and rightly deserve the consequences. The problem with this comment is that there are NO facts or descriptions to back it up, no explanation of what was done via Onyx, and no supporting material. I think that this is just a flame comment by a competitor or troll to damage the reputation of a superb application.

If you use Onyx knowledgeably and correctly, it is a great tool, and you certainly can't beat the price.

RTFM!, and don't clear system, font, application, or kernel caches, etc. unless you KNOW WHAT YOU'RE DOING!