What you really want to know is "guys, can you guarantee I won't have buyer's remorse?", and the answer is no. There's always something new & better coming out.
As said above, the thing that left a number of people feeling "burned" was when the RAZR Maxx came out shortly after the RAZR. The RAZR HD & HD Maxx came out at the same time as each other, a year later, about a year ago, and now the Ultra and Maxx were released at the same time. I doubt Motorola will come out with another phone in the very near future, as they're focused on the Moto X right now, but you really never know.
For me, the most likely device to make me possibly wish I would've waited to buy my new phone, instead of the Maxx, is the Nexus 5. But it could be anywhere from days to months until it's announced. I'm loving the Maxx, and have nothing worthwhile to complain about, so I'm a happy camper, and I doubt I'll end up with buyer's remorse.