STEP Standard Provisions vs custom provisions

I would be grateful to know members’ views on incorporating the STEP Standard Provisions with your Wills (perhaps with some omissions and supplemental clauses) vs including a full set of administrative provisions, whether that be your own or else taken from a precedent such as Practical Will Precedents.

Incorporating STEP allows for much shorter Wills, which is perhaps cleaner and more convenient, but do members consider that STEP provisions are sufficient in most cases?

Tobias Gleed-Owen
Hewitsons LLP