Yes…bought one recently to compliment my drill/driver, both DeWalt…combination made light work of our new decking, can only think it would have been a lot more laborious getting by with just the drill/driver.

Undoing screws is where impact drivers excel. Even rounded off heads that a normal driver won’t budge can be extracted because of the way the bit gets punched in as it turns.
For inserting small screws that don’t need to be torqued up a lot, stick to your small drill until you’ve developed a sensitive touch with your impact driver.

My favourite tool. Another life changing moment vote here.

Impact drivers and Dremels. Kit that once you have you wonder how you managed without one before…

IMO, it’s a yes qualified with an if.

The little hex ones are great if you’re either screwing a literal thousand screws (especially big ones), as they save having to swap bits to drill pilot holes for every single flipping one. Wish I’d had one when building the summerhouse, the T&G roof alone is held on by 700 screws!

Or if space is limited as they’re about half the depth of a drill due to not having a chuck.  Taking off trim screws under a car, I’d probably not bother unless a lot of them have clearance issues.

For actual usefulness you need a 3/8 or 1/2″ driver. and those are only useful when you would otherwise need a breaker bar big enough to make Archimedes blush.  And even then for some applications (e.g. rusty lambda sensors) the recommended tool is a ring spanner and an air hammer (something to do with galling the threads).

THIS is an impact driver – over 40 years old and still working!

I have one of them wheels – great tool.  Use it for seized cross heads.  Don’t see the need for an electric one.

I have one of those too. Bought when I was replacing the cheese-like Philips screws on my GS750 for steel hex screws. That makes it even older than wheels’s example 😀

Ah well, I said “over 40 years” – I didn’t specify by how much! I still use it though.

Impact drivers don’t normally have torque control so it is easy to drive the screw too deep and to get consistency of head depth, I get a feeling they are usually used for first fix operations. I have that cheap erbauer one and it is fine

and to get consistency of head depth

You use a shrouded bit