One thing I would add to HiddenG's post is the latest CM10.1 ROMs for the HD+ now have phenomenal deep sleep and good battery life. Almost as good as stock. On all platforms, emmc, Hybrid SD and Original SD.
Since I have two devices so I can troubleshoot and help people, I run all three, rooted stock with Hybrid CM10.1 on one device and emmc CM10.1 on another. For just pure use, I like the emmc the best. It is fast, smooth and trouble free. And I have CWM on emmc so no booting to SD for anything on that one.
Sent from my Nook HD+ running CM10.1 on emmc.
See my Nook Color Tips Thread here
and my Nook Color EMMC Partition Repair Thread here
and my Nook Color Updated CM SD Installation Instructions here
and my Nook HD/HD+ stock tips thread here
and my Nook HD/HD+ CWM Root Tools thread here
e.mote's Nook HD/HD+ Dummies Guide for installing CM10.1/CM10.2/CM11 here