TLDR: The device is slow, runs hot enough to burn me, you cannot customize it much, it did not work properly when i received it, the battery doesn't last, and it is generally unpleasant to use.
I have had my Surface Laptop 5 in the Christmas Holidays of 2023. Ever since, the experience has been terrible. Firstly, the setup of the surface lead to a non-functional touch screen. This is a major selling point of a surface laptop for me, and I was disappointed to see my fancy new tech not work on arrival. Alas, I installed windows 11 from an installation media USB. This time the touch-screen worked. However, the battery kept dying. From the moment I got the laptop, the battery would last about 5 hours, which has since degraded to 4. This is nowhere near the advertised 16. I don't do intensive work; I primarily work with spreadsheets and word documents.
And with time, it became slow. Windows would be using 80% RAM and opening apps would fill into swap space. This made the experience janky and slow. Not to mention that it made even the touchpad laggy, which made coordinating any actions on the device implausible.
Then, the CPU ended up at nearly 70% at any given time. I was fed up and re-installed windows; this fixed it for only about a month. My startup apps were nothing except for Komorebi, YASB, and defender which I had tried going without Komoerbi and YASB. Regardless, random processes would fill up my processor. All of this with a constantly hot CPU.
Moreover, the touchpad drivers had to be re-installed several times. It simply kept stopping. This was terribly inconvenient when I did not have a mouse available.
So, I abandoned Windows; I now use Gentoo compiled on a different device to give it the best chance. RAM and CPU are no longer an issue! Battery life now lasts closer to 6 hours. but heat is still an issue. It overheats to 100 degrees anytime I compile a program or do anything intensive, which literally burns on my lap. A "laptop" that cannot sit on top of your lap. I thought I would just change the fan-curve but this is not exposed as something you can alter, only something you can view. The chosen fan-curve by Microsoft is NOTHING until 100 degrees. Moreover, how the device exposes its keys does not allow my device to be woken by anything but the power button when sleeping.
More general hardware complaints are that the feet on it fall off due to the overheating. This happened when I was still on Windows, so it is unrelated to the workload really. They will provide new feet to stick on, which for me soon thereafter also fell off. The camera is terrible quality. The battery runs out even quicker than the aforementioned 4 hours on any reasonable brightness. The keys on the keyboard are difficult to get off without snapping the strange little arm underneath that feels like it is placed there simply to break. The metal the laptop is made of smudges notably anywhere you touch it, especially with tine (the back, front, and next to the touchpad). It is heavy because it is metal.
Even the bios has issues. Not only is nothing customizable (including the fans), but on disabling secure boot you get a large red bar with a badly designed white lock unlocked appearing every time it boots. People ask me what it is often.