I have DINC2, which I got as a replacement for DINC when it gave out after a ginger bread update. So essentially I got a new phone free.
When my update came I seriously thought about purchasing MAXX, although for my daily use DINC2 is just fine (when you just want to read emails and occasionally browse the internet, you don't need super duper screen resolution or ultimate processing speed).
However, when I weighed the pros and cons between MAXX and DINC2, there wasn't much difference except that MAXX had enormous battery compared to DINC2. For me, 4G is not much of an issue since I'm mostly connected to WIFI at work and home. So I asked myself if $300 was worth it for bigger battery and the answer was no. I just bought 2400 mAh extended battery for DINC2 and I'm very happy with it.
Until MAXX is more compelling, like having bigger screen size and HD qualifty, I just don't see that much differentiation between MAXX and some of the other phones available right now (excluding HTC One and SG3). So if I were you I would wait until what Moto has to say about the next MAXX, to see if it's worth putting $300 or just to save yourself some money if the current MAXX is reduced in price by the new announcement.