As others have written, this is a wonderful thread!

I'm still using the stock flatbars that came with my bike, but just today added a pair of extensions onto their ends -- after only one ride, I can feel the difference in my hands and arms (and "yes", it's a positive difference).

Still, my issue is one of handlebar height, which prompted me to buy-and-install a 3-1/2" steerer-tube extension. However, the handlebar stem angles forward, which (somewhat) defeats the extension.

While perusing the links in the OP's post, I found this at JensonUSA -- interesting, and the price is certainly right. Maybe with a different stem on my bike...