I have had my Galaxy Note 2014 edition for 6 months, (plus a little more) I have encountered no problems along the way. I use this device for everything from school to leisure. I watch movies, play a couple games, Farmville - Country Escape, and Mindcraft Tablet edition. I have downloaded numerous applications, including Word type program, anti-virus (avast) Banking apps, and several more.
The battery life is great, I have been able to watch 4 - 1 hour episodes of a series. Games such as Farmville - Country Escape, the battery might last 35 to 45 minutes, it does drain a lot of power.
The grafx are great.
There has been no lag with response from touch to load an app.