Plenty of people have done just fine with the stock HH tarps...not much room to cook or dress and not very comfortable, but with proper site selection and pitch it's adequate. Sgt Rock went through a hurricane with his.
But if you want more comfort (like most of us), there are several options. The HH Hex is one, and probably your cheapest if you take his offer. I haven't used these tarps but I've seen them - they're very roomy, if a bit heavier than some other options, and the ones I saw seemed to be well-made. The MacCats are awesome and pitch MUCH tighter than the Hex, and you can pick your size. I use the Standard and haven't gotten wet in the rain...others here like the huge Deluxe. Brian, who posts here and on several other forums, makes the MacCats. And JRB (made by Peter Pan and Smee) offers an 8x8 that gives an 11+' ridgeline and plenty of room for cooking and changing, plus keeps the ground pitching options of a square tarp.
And there are plenty of non-hammock-specific tarps that will work fine. A standard 8x10, for example.
So I wouldn't be quite so hard on HH - the tarp has been proven adequate by lots of users, and Tom H. doesn't claim that the stock tarps are large and comfortable...just that they'll keep the hammock dry when pitched correctly. So if you want more than "adequate," and many of us are with you on that one, then it's a personal decision rather than a shortcoming of Hennessy Hammocks. But that's the beauty of this kind of gear - you can customize it however you want to. And a bigger tarp is one of the options many of us choose.
JMHO, of course.
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