Essentially, it's like taking the Legend 2 with a lock/unlock feature for the device via touch when you have it in your hands and when you put it down. Practically, however, this function is useless as it serves no purpose. It goes without saying that to vape, you have it in your palm. Even if you have it in your pocket, the device often thinks you have it in your hand and is usually unlocked, and therefore so is the power button.
There is also the Boosting function in power mode, which practically gives you the maximum possible power for the specific ohms of the coil, as well as the eco function that does exactly the opposite.
I noticed that sometimes it struggles to read the resistance correctly, especially when we are talking about 0.15-0.2 ohm, and it constantly displays the annoying new/old message like when you change the coil. But it's not something terrible that bothers.
Other than that, it's like all the Legends. Reliable and sturdy quality construction that comfortably accommodates atomizers with a diameter of 25/27 mm and supports all vaping modes.
If you do not own a Legend 2, then it is worth buying. Otherwise, I don't think the Legend 3 offers anything new. It is also slightly larger in volume.

Coming from the pico 75 and Aegis solo100
I have the following to write. I have had it in my hands since yesterday. Very good battery management compared to the other 2.
Sturdy construction and you can feel it in your hand.
The graphics it has in each mode are beautiful.
The smart mode correctly recognized the resistance (Zeus nano 0.6omh)
Now as for the contact lock, since I saw several foreign and Greek presentations saying that it unlocks even over clothes, they are right.
So it can be pressed inside the pocket.
However, it is quite unlikely to happen because the ignition button works the same way.
The only irrelevant thing I found is the so-called memory function.
Yes, it saves different modes but until you enter the menu, you can do it from the buttons.
It might be a bit practical if you play with both wattage and temperature.
Update 30/3/25: It has been about two months since the touch lock stopped working.
In this, the company disappointed me because I have preferred their products for years.
Now I switched to Pods, and after various tests on factory and repairable ones, I concluded that it is a one-way street for a cigarette-like feel, so I have set this aside