The ones Cornwell sells are not so great, on stubborn screws they break or twist.

I really like Snap-On screwdrivers.
While I was working in the restoration shop I had a set, and most of the other guys had different brands, some better than others. When they could not get a screw to move they always came to borrow my screwdrivers, as more often than not the Snap-on screwdriver would hold onto it and turn it out.
On some really stubborn ones every now and then you twist the tip a little, but the Snap-on Dealer has no problem replacing it. they even have a hex on the shank so you can put a wrench on it for that extra oomph.

Another interesting fact on Snap-On screwdrivers, the small replaceable 1/4" hex screwdriver bits, they are guaranteed, and if one breaks they replace it. I thought they should not, as they seem like a consumable item to me, but they do guarantee them.
I have a Snap-On ratcheting screwdriver with a number of the bits in the handle, every few years I have the worn out bits replaced.

Grigg


1951 GMC 250 in the Project Journals
1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-