Interesting thread. Be careful as this is in the public domain and anything that you say that could be construed as slander may well have some direct repercussions to you. You are responsible for what you post.
You might be better to ask the question "has anyone had any issues with xx as" ... "they are not responding to my emails"; or ...."I have been receiving damaged product", or ... "I'm still waiting for parts I ordered 4 weeks ago", ... etc etc
Stick to facts. Also by asking you will get others to either agree there are issues, or you may find that you have been exceedingly unlucky/bad timing/whatever and most people think they are great.
Do note that anything that is clearly unfair, defamatory, or that creates conflict will be deleted by a moderator. This is not the place to start a war. I know that being helpful by pointing out issues is always going to be close to this line.