Verizon PTT (Push To Talk) vs Nextel's Direct Connect?

Amp300 asks: "I am currently a Verizon Wireless customer in the Detroit area. I am thinking about getting a Motorola v60p and upgrading to the Verizon's new PTT (Push To Talk) service. Is anyone familiar with the v60p? I have heard the battery life leaves a little to be desired. I am familiar with Nextel's Direct Connect, but I have been told that the two services are slightly different. I was wondering if someone could make an educated comparison of the two services?"