While I do not use if for a microwave cart specifically, this has been a great, sturdy, heavy duty piece of office furniture for well over a year.  I built this and put it in an office that sees frequent traffic and lots of use.  We use it daily and the drawer, shelves and cabinet doors have handled all the use and abuse I could ever expect.  I took a chance on a non-office piece of furniture, since it actually had the set up we were looking for, and it has been absolutely ideal.  If you're in the market for a durable, inexpensive and functional item, for whatever room, I'd recommend this!