There's not too much to say about the Omni Adapter, as in-of-itself it is a very simple product.
Design: They have clearly put a lot of thought into optimising the shape, ensuring that the stick is still balanced with your hand resting heavily on the stick. Between this and the springs in the base, it naturally stays in the neutral position and it isn't too easy to accidentally input drift to the left, which just looking at it I was a little concerned about.
Build: The build quality is excellent. It has been engineered & built with solid materials so there is no flex at all in the adapter.
Installation: Very easy, they even include the tools that you need between what came with the stick & base, and what comes with the adapter. The video tutorial is clear & easy to follow. You have to open up the stick to take out the original base adapter and replace it with the Omni, but all of the connectors were easy to access & remove, and it went back together like it was from factory.
Usage: The change in hand position is actually a little more comfortable & it is a really good feeling to push the stick forward like a throttle. Having said that, boy was it weird to use in Star Citizen after being used to having two upright sticks. I thought it would be easy to adapt to the change, but I had to fight my muscle memory for a couple of hours to get used to it.