The biggest complaint of the Note 5 has to be the lack of a micro sdcard slot. Their are two memory variants available so far for the Note 5. You have a choice between a 32GB version and a 64GB version. Their is a 128GB version said to be in the works, but may not be available in the USA. The 32GB version ends up giving you about 24GB of actual storage space after you account for the space that Touchwiz takes up.
I personally don't need much more than that since I am not a heavy app user, and don't really store songs and movies on my device. I use services like Pandora and Netflix to stream music being that I still have unlimited data. Many of you that do not have unlimited data and are not always around wifi store lots of music on your device. The Galaxy Note 5 actually supports OTG "On The Go" micro USB support. You can use an OTG USB cable to connect a high speed flash drive you already have to your device for extra storage, or you can grab an OTG flash drive.
OTG Cable $9
Sandisk 32GB OTG Flash Drive $13
Sandisk 64GB OTG Flash Drive $24
Sandisk 16GB OTG Flash Drive $9