I got my system earlier today (without giving scalpers a single penny), and transferred everything from my oled switch. Regarding the physical aspects of the system, I would say my first impressions are positive. The joycons snap onto the system with slightly less wiggle than its predecessor, and joycon removal is also simpler. The kickstand is decent, although it's a tiny bit flimsy, it does not break off like the kickstand on the original switch. For your physical games, I find the game card slot to be far easier to open compared to the switch oled, which can be a major nightmare to open at times. Overall I would say that the build quality is decent. But the size itself is large for a handheld, which may need a backpack for travelling with it.
For my games, I went with mario kart and decided to give the welcome tour a shot.
My main note with Mario kart world is that online play is far more chaotic than mk8, which is helped with the introduction of new items and lobby sizes also being twice as large. In a race, you can easily drop many positions from 1st just by getting hit by a shell, and then getting immediately run over by someone else who used a giant mushroom. I havent played too much to know if it's my luck, but I suspect that this might happen less over time as casual players and kids get the system, and the average player becomes slightly less skilled.
The welcome tour is a title with the purpose of demonstrating and explaining new features on the system, with tech demos, quizzes and minigames. They're all located in 12 different Areas (Lettered A through L) which represent a part of the system or a peripheral (for example, area A is the left joycon, H is the inner of the left joycon, and letter G is the switch 2 camera), which can be individually unlocked by collecting all stamps in the previous segment (Collecting all stamps in area A would unlock area B, and all stamps in B would unlock C).
The tech demos would be used to demonstrate features such as hd rumble 2, VRR, HDR etc.
Most of the minigames use the mouse, including the minigame which requires a 4k screen where you have to click on an area with a single illuminated pixel (which I managed to do on my 1440p monitor, which accepted a 4k signal), or having to navigate a cursor through a speed maze within a specified amount of time without touching any walls. There are other minigames that dont use the mouse, such as one where you guess the frame rate of an animation, or where you play a game of twister with 10 fingers on the switch 2 screen. (crippled person who doesn't have 10 fingers? you can walk up to the minigame, and signal sos in morse code with the y button to skip it)
Not all minigames are unlocked from the beginning, they can be found in seperate segments, and can require a certain amount of medals, which are acquired by playing earlier minigames good enough.
The whole title lasts a few hours, there is little to zero replay value, and the minigames are essentially a singleplayer version of 1-2 switch. Although the purpose is different, at least 1-2 switch had local multiplayer and was somewhat useful at parties. It would have gotten better reception if it was free with the system.