I received my connectors yesterday and I have to say they are actually pretty nice. They are compact, solid, and even though they won't rotate it would take a lot of rotational force to damage one. They have a nice insertion feel, and it's not going to pull out or fall out. It's compact enough to fit just about anywhere, and the only drawback that I can see is the manditory direction and overlap of the 90deg connector. The biggest thing is it's easy to use, the 4 pins are far enough appart for fairly easy soldering, easy to isolate each of them with heat shrink. This is a huge contrast to some of the 4 conductor 3.5mm plugs that I have soldered.
Over all it excedes the expectations I had of the connector, and even though I had the dimensions from the data sheet, I was surprised by how small it really is. Ray's photos make it look quite big, which means his new amp is actually very small.
The only thing I could ask for is a straight plug version, and that might come in time if it starts to catch on.