Others can please chime in here also. For jotting a quick reminder or note I think it could work fine.
If you notes are bullet format, I think it could works also. I think if you are looking to take extensive notes, I think the GNote my be too small to be useful. You will run out of room fairly quckly unless you write really small. I have attached a note with my average writing size to give you and idea of the size if a memo.
If you are writing a reminder list, tasks, appointments to put into the s planner I think it is great. For detailed note taking, I would still prefer my small bound 9.5 x 7 inch bound memo book.