It's important to read it carefully. I was selling an entry-level property recently, and some renters wanted to buy it. They were aware (they thought) that there was a 2-month penalty for breaking their lease early. They made an offer on the property I was selling. Then, when they went to tell the rental management about breaking their lease, they found out that they'd misread the lease--it really amounted to a 4-month penalty. So, be very careful.
Second, having issued that caution, there's nothing wrong with the arrangement you describe. The problem, though, is that you don't get to choose your own agent, and you may not be satisfied with the service provided by the management company or its agents. So, I'd discuss it with them and interview them (or some of their agents) just as you'd do normally. If you feel comfortable with the level of service you'd receive (and the contract provisions themselves are OK), then it shouldn't be a problem.
So, be cautious. But it's an acceptable arrangement in concept.