I think the video says it all vs the Garrett at least. I have a TRX and no complaints. If for some reason (big target, length of wire) its sounding off loudly and you can't pinpoint the exact direction, tapping the button detunes it so you can. I feel like the stronger signal it has when you detune, the more detuning it does, so sometimes its better to back away a bit before detuning. I also like that the TRX responds FAST. Tried a chinese knockoff carrot, and realized it wasn't just the poor range, it was the delay in responding that made it frustrating to use. On the surface with the TRX I may get a steady tick tick tick tick, then I find the spot where it does a double-tick, repeatedly, easily. Dig there, coin depth 3-4 inches. Ok, one complaint, but probably universal to any device with just one button -- trying to remember the sequences to change between sound, vibe, and sound+vibe, and lord help you, any extended settings. A second button would have been nice.
No F-Pulse experience. I like a lot of depth, so I'd like to try one, but iirc its not that much deeper than a TRX (if at all?) so not on the shopping list anytime soon.