I have also picked up HBO for the duration of the series. The first ep was pretty good. I kind of like skipping over boot camp and getting quickly to Guadalcanal. It was kind of a reminder of how fast the boys were rushed into combat and of how new the war was for the US: nine months compared to two and a half years when Band of Brothers gets into the fighting.
I thought the thing with the tough-talking captain losing his head in the battle was kind of a cliche and not really necessary, and it wasn't from the Leckie memoir so I don't know why it was added.
The look and accuracy of the show seemed pretty good, though I did spot the officer that briefed the marines in front of the map wearing a ribbon for a PUC, which hadn't been awarded yet.
All in all, I liked it a lot and am looking forward to the rest.
--Justin