Man tapers are a hard bunch to please.
The microtrack comes out and everyone complains that it doesn't use AA batteries that are universal and field replaceable. Now people see them in this Tascam and want an internal Li-ion solution. Lots and lots of handhelds use only 1/8" inputs and people complain that they want a locking XLR input. This one comes out, and nobody is interested. People complain about poor battery life or low max input (this one has 15 hour battery life and takes 20dbV) and again, no love.
This probably isn't a recorder I'm interested in, but I would think it might fit the bill as a 2ch recorder, at least for some. It takes a hot signal, has XLR inputs, and good battery life. Most people don't seem quite satisfied with a handheld as an all-in-one solution, but if you want it for that, it'll do it.
As to battery life as an all-in-one, they say 15 hour battery life, presumably that is without phantom, so say it draws about 200mA. It uses 3x AA batteries, so considering that and a reasonably efficient DC-DC converter to get up to 48v, phantom power for a couple of condenser mics might add another 150ma or so -- all told, this should provide 6-8 hours of use even with phantom on.
For what we do, I think the DR2d is better as a 4ch recorder, but for a 2ch recorder, this seems like a good option, especially for the people who feel they are more comfortable with a recorder that offers locking XLR inputs.