I have Cyberpunk 2077 on GOG, played about 2-3 hours last night.
I didn't encounter any major bugs as far as I could tell, no crashes and it runs reasonably well on my i7-6700K, 4GHz, 32GB ram, M2 SSD, GTRX1070(!), except I noticed a bit of slowdown during the driving and shooting out of the window parts. I have Film Grain and Bloom turned off, volumetric fog turned down to medium, every other setting is on High or Ultra. Walking around in the city with tons of NPCs doesn't give any noticeable lag, but I have not checked the actual FPS.
But, major annoyance for me: The KEYS. You can remap MOST of the keys, but certain keys seem to be hardcoded, for certain times in the game. F is a big issue, there is no way to rebind F(Select, Open, etc.) and I cannot find it anywhere listed in the settings at all. I normally play on number pad, and move everything over to that side, but some of the nearby keys, HOME, some of the Arrow Keys, are also locked to whatever, and cannot be rebound either.
I'm currently using the default WASD, which is playable but not anywhere near optimal for me. The BrainAttack/Hacking thing also doesn't seem to like being rebound, multiple sets of scrolling left-right key groups feel like they could have been combined, etc.
What's odd is when I was on the numberpad, sometimes KP_ENTER would work as F(select, open), sometimes it would not. Extremely aggravating.
Hopefully there is either a patch or mod out eventually to remap all the keys.
PS. Playing as a male Nomad on Hard difficulty, melee and stealth seem strong to the point of being overpowered currently, and I had my guy setup(barely) for guns. You can instakill or disable same or near level enemies from behind, and sneaking or sneaking + hacking distraction means you can get the drop on quite a few people. Conversely, at least so far with my shit armor, trying to stand and fight against random trash gets me shot to death in seconds. Cover is required, which is okay I guess.