Got my Saturn 3D controller today!
This is my first time using one - can definitely see now where the Dreamcast controller design originated from, especially with the triggers at the back and the overall shape.
I find it interesting that the analogue stick isn’t a stick at all, but what looks like a grooved-top trackball with limited movement (no rolling). That does make it feel a bit too tight for large movements - more like a slide pad - but its sheer size makes it perfect for making fine adjustments which would otherwise feel twitchy on a stick. I gave it a go with Shutoku '97 Drift King and the fine adjustments you can make when turning are very impressive - even if large turns feel slightly underwhelming given the travel to stick-size ratio there.
What is an unsurprising revelation is NiGHTS. It says a lot that I was struggling to get B ranks with the D-Pad and mostly averaged C ranks, but with the 3D controller I got straight As replaying a world. Really does feel sublime under the thumb.