SQVI's target audience

Dear SAP Gurus

My question is actually a discussion and an attempt to probe the sponsoring thought behind the use of SQVI?

What is the best practice around giving SQVI to end users on the production? Is it a common practice or a rare one? or is it something which is given to the power users and not all the end users?

Is there any variation in the answers to the above questions given that SAP IS-U is in place (given the fact that very few standard reports are pre-built)

Appreciate your point of view and core SAP thinking on the same ...