The reason I like this one in particular (and I purchased many to try to find the perfect one), is that it is very fat and rubbery, so gripping it is much easier for those with EDS. Also, the tip doesn't have to pushed down very hard in order to work, unlike a lot of others that I tried where you had to force the tip down hard to make contact and use it. That tires out fingers and hands very quickly, and can even dislocate joints.
Why a stylus instead of just using your fingers? Well, for me, it makes using my phone and Nook much easier. My fingers aren't as fatigued and I get more done. It's a win-win in my book.
You can hold the stylus several different ways, whichever is easier on your own hands:
The proportions are just perfect for my hands...much easier than the skinny ones...
You can purchase the Cosmonaut directly from Amazon through my LifeWithEDS Store, just visit the shop! It's the cheapest I've found it on the web.