I have a few pens and I like two above the rest, because they are heavier and feel more like a real pen. I also have the 8pi and while the top end works as an eraser (a nice feature) overall it is just as light and flimsy as the included pen. Samsung released a stylus holder for the original Note (you might have to look for that on eBay now) that comes with an original stylus that you inser into the holder. You need to be a bit careful so the click buttons align up, but once it is installed it has a very nice feeling and you can easily use it for note taking during a few hours without your fingers cramping. A nice bonus is that you can use the small stylus as a replacement in a Note, if you have that model and would need it. It is then easy to replace that with an original stylus from Samsung.
The other pen is a BT stylus, hence you can use it for phone conversations, or Skype/Line as well. This one is a bit more expensive due to the BT feature, but it is also heavier and bigger, hence even more easy to use for long periods of Writing. I have actually used it for a six hour session once and neither my hand nor my fingers ever cramped. This is also a Samsung original, and you may have to get it from eBay because, while I'm not certain, I do believe that Samsung only released it for the Asian markets.