1. Well made jacks, easy to solder and appear sturdy enough for heavy usage.
2. The threading and nuts/washers are high quality too so that's nice.
3. Solidly made for its purpose. The small insulator strip along the inside of the long sleeve terminal is useful to insure ring and tip terminal solder connections don't short to sleeve.
4. Great price, and saved me a headache of running around town looking for the right item.
5. A hassle-free 12-month warranty and friend customer service.