That seems very similar to the 200 Watt Wharfedale Pro cabinet I am using with keyboards in my live rock band. The only difference with a the box I am using is that it is covered with a molded plastic surface that keeps it protected when I drag it around the bars we play in around Los Angeles.

I have been using it for almost 2 years now and it has never had a problem. I wish I could say the same about the Roland KC-300 before it but that couldn't handle low frequencies at all ( the cabinet on the Roland sounded awful, it buzzed and always sounded like it was about to fall apart ) so I returned it for the Wharfedale. That was the best decision I made.