In the electrical world there is Klien--Greenlee--and Ideal.
Yes, I own some Greenlee pliers and have used MANY "big" Greenlee tools like hydraulic knockout punch sets, wire pulling motors (chuggers), job boxes, etc, etc. If you are a contractor buying "big" specific equipment, they're on the top of the heap.
As far as hand pliers and such, their job specific tools like crimpers, strippers, and such-they are the same (almost) in price and quality to Klien or Ideal. Each company has different variants, and proven performers, that one person may prefer over another.
On wrenches, sockets, ratchets- I have not personally used a wrench, socket or ratchet from either of the above 3 manufacturers. I'd bet for price and quality though, I'd buy that stuff from another manufacturer.
But if you can get a smoking good deal on them I doubt you would be sorry. They are far better than HF quality in everything, on somethings they are the SnapOn of the the electrical trade on other things the the Craftsman of the trade.