
Wooting
80HE
Competitive gaming king, but typing feel and sound are meh.

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I had a huntsman mini v3 and before that I had the full size huntsman. I use it for gaming and software development. I have the ghost case and Geon Raw switches with the double shot pbt wooting keycaps
OP1 8K with Bungee and a Huntsman v3 pro
Depends what you mean by best. All will have similar performance. Wooting has the best software but you can get keyboards like the MadLion for £40 which have better performance across the board. It just isn’t worth buying Wooting at the moment unless you want analog output which is only supported by Wootlity and Synapse. For 75% the K2 HE is a nice board for performance and quality sound/feel. If you only care about performance the Huntsman V3 Pro has the least dead zone space and better control over the switches in stock performance due to weight and stability. Hall sensors are extremely cheap to produce now. When Steelseries revived Hall effect PCBs were quite expensive to produce. Depends what you want honestly.
The Huntsman v3 Pro is actually solid for comp gaming despite the hate it gets here - most of that comes from people prioritizing enthusiast features over pure performance. If your friend's offering a good deal and it's barely used, that's probably your best bang for buck in that range since new hall effect boards with similar specs usually run closer to $150+. Just make sure the polling rate and actuation settings work for your games since some titles can be finicky with hall effect switches.
I like it. It is an interesting piece of tech. Feels natural for gaming. My only concerns are text typing feels weird without feedback, I slam the keys all the way down and it affects my type speed. And key springs are too tight for my taste, my finger tires from constantly pressing W i.e. I disabled rapid trigger and adjusted key press depth for that reason. About your questions. I had no problems with synapse whatsoever. You can adjust depth of press by 0.1mm single key, multiple keys, all keys in synapse. And you can see your current depth of press while pushing any button on the keyboard. You press a key to desired depth, see it on a meter, set the desired depth, really easy. Moreover you don't need synapse at all, just press Fn+Tab and you can adjust depth of press any time with a volume wheel or arrow keys, the keyboard even has integrated depth meter to try it. About build quality, I haven't found any defects. The keyboard is made of plastic with metal rim/bumper, keys are textured, leds are inside the key shafts so there is no bloom/halo around the key, just engraved letter. The palm rest that was included is kinda cheap tho, it is not leather, not even soft, just plastic. Probably to sell you their Pro rest variants. There is no sound at all if you don't smash the key all the way down. No mechanical sound, click or anything, just plastic on plastic. But as I said earlier it is difficult to type, so you will probably hit the keys to the bottom first time. The sound doesn't bother me at all, but I'm also a blue switch enthusiast, so my opinion probably doesn't matter.
Opposite experience with Synapse vs iCUE. Though both suck, but not in context of what they do. People just expect a lot more plug and play in 2025 vs troubleshooting. If dead set on Razer, Huntsman v3 is their “Hall Effect” equivalent competitor. They have several form factors too.

Wooting
80HE
Competitive gaming king, but typing feel and sound are meh.

AULA
F75
Budget thocky board, but poor software and shaky Bluetooth.

AULA
F75 Max
Affordable thocky sound, but wireless connectivity and software are lacking.

AULA
F99 Pro Mechanical Gaming Keyboard
Great typing feel out-of-box; software and RGB are weak.

Keychron
K2 HE Wireless Magnetic Switch Custom Keyboard
Good value HE for gaming/typing; limited switch compatibility.

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Wooting - 80HE

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NuPhy - Air60 HE Magnetic Switch Gaming Keyboard

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Corsair - K95 RGB PLATINUM XT Mechanical Gaming Keyboard

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Wooting - 80HE