when they arrive be sure to post pics so we can see the size in real life situation!
Do those need pins? And how does the cable seal with back end of the free-hanging connector?
Alright here are some pictures. It is nice and small, but the solder cups are too small for 18Ga wire to fit in, and also they get pretty close to touching with the bigger wire too. 20Ga is about the biggest you would want to use.
They fit together nicely and you can definitely feel it lock together with about 1/4 turn, but they are just plastic bosses which will weaken after probably 200 or so connections.
Once the wires are soldered onto the cable end, the stepped down rubber thing slides over the joint and fits snugly in there, then the back piece slides on and locks. If I had round cable, this would be 100% water tight, but as you can see in my pictures above, they my cable flat so I'd have to put some silicone as well. It's tight though, that's for sure.
Overall I like it, and will use it, but I think I still like my right angle barrel power connector and standard 5.5/2.5 jack, for price and simplicity sake.