The 2015 generation is the first Norton I have ever tried and I think it's very good.
It's definitely extremely light, though I have only tried it on a modern PC. The only downside in my opinion is Chrome x64 compatibility. I wouldn't use Identity Safe but malicious website blocking requires the toolbar to work. That's kind of puzzling because Norton scans the http stream and intercept attacks there without the toolbar, for example it blocked the exploits on wicar.org regardless. Kaspersky can still block malicious websites without its extension.
Though I suggest disabling the disk optimization tasks as I am not sure whether it does distinguish between a SSD and HDD and SSD defgragmentation is a very bad idea.