Yeah, My dad. I've flown with 5 other instructors, And dad is by far the most exacting, most difficult to please, And most professional pilot I've ever flown with. I've been with him from day 1, and am glad I could. The occasion I've flown with other instructors was for tailwheel, seaplane, rental checkout, And checkride prep "second opinion" flights.
He is a difficult man to please, And the consummate professional, and I feel it when I fly with other instructors, they're "too easy"
I also feel like he expects more from me than his typical student, so there's a lot of pressure.
Nothing is "good enough" until it's textbook prefect.
I think it's made me a good pilot.
I think every pilot who desires to fly professionally should strive to fly to the highest standard possibly achievable, And if this instructor can help you get there, good.
If you're flying for pleasure, you may want to fly with someone who will keep you at ease and make sure you're safe.