Before I buy an impact, let me first ask this of those who use one regularly;
How much stuff do you F*ck up by using one?
I ask because I have never used one and never really felt like I was missing out on anything.
Like most, I over torqued and broke a lot of bolts when I was first learning to wrench and therefore adopted a more tactile approach to assembly and torque.
For the last 3 decades, I have used an adapter in my 1/2" Hammer drill with the clutch settings to "tune" my torque.
I start everything by hand or with a ratchet and only use the hammer drill for disassembly, or to run in longer bolts.
I am well known for executing jobs in a fraction of the time with little to no call backs so I don't believe I'm missing out on any lost productivity either.
I can also count on one hand how many bolts I have snapped off or cross threaded in the last 30 years using this method.
My brother in law swears by impact and that's almost all he ever uses. He f*cks up everything he works on and is the king of turning an oil change into a three week ordeal with stripped bolts and all kinds of BS and repairs that have no relation to the original task. I believe he's just a chitty mechanic but I can't help but think that his love of tools he doesn't know how to use properly isn't helping him either.