The watch is probably only a couple seconds slower than the handheld. My issue with the watch is once I get an on point alert. It covers the direction arrow for 5-10 ish seconds. So I'll just look at my handheld so I can start closing the distance. Which defeats the purpose of the watch. Ive yet to find where I can modify that setting. Realistically the above is a 25% of the time problem, as I usually have their general direction in memory. Id bet 50% of my pointed birds dont give me a notification. Not because the device isnt reliable. They just dont hold long enough.
In grouse cover the direction arrow is spotty at best. But its usually good in pheasant habitat. I think this device is for piece of mind in always knowing you can find your dogs. It certainly isnt an advantage in killing birds. My beeper collar provides nearly instant point notification and makes it far easier to find a dog in thick cover.