Cool. They are neat. Do they have a high prey drive like the other Belgians?
Nope.
Here's the deal on the high prey drive Belgians that you see out there. They are from breeders
who do not herd, and then label the worst mannered puppies in their litters as ..... yup you guessed it .....
herding prospects. I've had and bred Belgians (Tervuren and Laekenois) since 1982. Not one of the Tervs from my line and litters I've bred have the "you start the bbq, I'll bring the meat" attitude. This is also true for my Laekenois.
Those high prey
herding prospect pups then go to folks who spend copious amounts of $ in training lessons and time and go off to AKC arena trials and stack up title after title with dogs that are run under robotic control. I've had some at my place that I wouldn't let near a stuffed sheep let alone a live one. That said I've had some great ones - but those all have come from proven ranch workers. LOL - one of my soapbox topics.
Here's how I rate the Belgians in temperament in general (and I've worked with all four):
Sheepdog (long haired black) -- party animal. What's in it for me? Is it fun? Do I have to play by the rules? see something - react and have fun (not necessarily good)

Tervuren (long haired mahogany) -- Jack of all trades, team player, see something - think - react

Malinois (short haired) --- live wire -- see something - react

Laekenois (harsh haired with curls) -- smarty pants - comedian, see something - think - react - can I make a joke??

I have seen a shift in the Tervuren leaning towards see something - react - though that could be just the area I'm in is changing.

I've always looked at herding, even when I did not own stock, as the rancher/farmer does not have the time to spend training those high prey dogs. They require a dog that needs minimal training. With that in mind, that is how I chose dogs to breed to (and yes correct conformation, breed type, health etc).