Pro range is really good stuff and I've used a couple of sets for over a decade and not a mark on them. The lifetime warranty is worthless - as posted above it excludes ratchet mechanisms, which are the only things that would bust. Also excludes any sort of excess use.
Halfords sell this stuff at 50% discount almost 365 so don't panic and select the set that you want. For instance this is 170 pieces, but 30 are screwdriver bits.
EDIT:
Just checked the warranty and no specific mention of ratchets, so they may have changed this??
Halfords Advanced Professional Hand Tools come with a Lifetime Guarantee
Should a Halfords Advanced Professional Hand Tool fail whilst being used for the purpose and in the manner for which it was designed, it will be inspected and replaced. Simply return the product to your nearest Halfords store with proof of purchase and we will arrange a replacement for you.
•Proof of purchase is required to validate the Lifetime Guarantee.
•Misuse of the product will immediately invalidate the Lifetime Guarantee.
•Discontinued items will be replaced with an equivalent product in terms of use and quality.
•This guarantee does not affect your statutory rights.