Got a 3D and 5A today. Agree with Fritz on the quality of the body and threads - very good, I've seen better threading, but definite quality. I'm wondering if the issues of varying thickness's of the tube can be attributed to the width of the bare aluminum on the tube end? That can be deceptive - the threading will make the tube wall diameter appear to vary when it doesn't vary at all, it's just the way the threading ends where the final cut/finish is. Unless you have a precise way of measuring the wall thickness down from the threads, I'm suspecting the cuts are centered well, though the bare aluminum on the tube ends appears to vary in thickness.
The 3D looks great in both beam, tint, and performance. The 5A came out of the box with a XP-L under stress - the LED centering piece was so forcefully driven, it appeared to twist the LED slightly, or caused the LED to rotate maybe when it was run the first time. The LED centering piece was actually partially over the LED board, directly digging into the dome. The tint was noticeably yellow, so I took pics, carefully removed the bezel, and with it all apart, the dome was already partially lifted off the LED - it was lifted up on one side, and easily came of with a slight nudge from a tweezer. This is not normal of course. It seems like the reason it occurred is because the MCPCB was jammed into the head to fit, but it really didn't fit - it wasn't fully flat. I could tell it wasn't flat by the thickness of the thermal grease, and concentrated only in the middle. The "BLF" was about 50% scratched off, and the edges of the MCPCB that stuck out were bent up. So, a lot of force was applied, like from a needlenose or screwdriver in an attempt to get the MCPCB flat. They could have sanded/dremeled the corners of the MCPCB that stuck out, but instead tried to use force.
For me, this means a LED replacement - I could re-use the MCPCB if I want to, after cleaning it up, sanding the edges down.
So if the tint looks excessively yellow, check the LED out carefully. I got one out of two done this way, so it could be the only one, or could be quite a few.
Btw, the MCPCB appears to be a perfect mimic of a Noctigon, or is a re-labeled Noctigon: form/size is the same, traces are the same, and the back and edges have the thin gold on nickel finish, just like a Noctigon.
The LED wires appear to me to be Teflon coated and not silicone - they are stiff, as stiff as the Teflon coated wire I have in the same sizes.