Don't do it ... simple as that ... unless you simply CANNOT wait for something better, or CANNOT afford to spend a bit more, or CANNOT tolerate the thought of using something that "looks less professional".
Very important to consider when looking at the MX9000 is that it is basically their new version of the original MX8000 and when that was released, it was to compete with a handful of alternate 8-Bus consoles.
The main competition was the Soundcraft Spirit 8 Bus, the Soundtracs Topaz 8 Bus and the Mackie 8 Bus ALL OF WHICH sounded MUCH better and proved MUCH more durable (yes, I know that every company has it's fair share of typical problems, but let's face it .... Behringer has a terrible reputation for faults).
I personally own a Soundtracs Topaz 8 Bus and have used all of the above mentioned 8 Bus alternatives including the original MX8000 at friend's studios.
Bottom line is that Behringer, in my opinion, came into the market and have remained there by adopting the following principal ... "let's first of all make our gear LOOK like the big league as such ..... then let's make sure it is MUCH more affordable .... then let's make sure it works adequately enough to keep a kazillion people out there arguing that there is nothing wrong with it and that it does the job".
Sweet ... no problem ... everyone to their own ... but what I am suggesting is :
1. Spend the same amount of money on something else.
2. Spend a bit more on something MUCH BETTER.
3. Spend less on something MUCH BETTER.
4. Spend less on something perfectly adequate for your needs.
Cheapest option out there (used) is the Soundcraft Spirit Studio, which ONLY lacks the meterbridge really, probably followed by the Topaz and then the Mackie (based on what I think are typical used prices ... I may be wrong).