Having replaced several power supplies, I'd be happy to see an external brick. I'd get one extra brick, just in case. And, nobody should forget, if the 44 goes south, all the content goes with it. So, even if you have 24TBs of capacity on a 44, it's all gonna be lost. If D* solves that problem, I'd be really happy.
I am not exactly against the expernal power supply as it does allow easy replacements if there are to go bad, and it helps get the heat out of the main unit. However, I am not happy with the fact that it seems like they have used some kind of non-standard, or proprietary power connector for it. This can make it extremely annoying to place if the cord is too long/or more likely too short. If they had used some kind of standard connector you would be able to buy longer/shorter cables to replace the original one to get the length you need.