If you are considering coming back, and you have been gone for awhile, just be aware that DBG has recently (in the last year) gotten more aggressive with ban waves. SO, with that being said, before you come back and play with MQ on live, you have to get good in your mind with losing your accounts at a moments notice. Meaning, if you can accept starting over at any moment, then you are good.
When the ban waves happen, so many rageful posts about being banned, and then the investigation train starts rolling on trying do discover how they ban and why...etc etc. Unless someone is on their payroll, we will never know. So, there is that.
Also, check out the post in my signature for tip when using MQ. It might be useful to you