The Perfect Buyer's Guide

What would the shopper in you like to see in a buyer's guide?

[hairycoo]

I'm a fan of the "really useful website" concept and since many of my future projects will be built around a type of product I wanted to hear what you'd consider a useful buyer's guide, from a shopper's perspective, what should/shouldn't it contain?

- the what, how, why, when, etc sort of questions
- faq
- product comparison
- directory of stores/merchants where you can get/rent the product
- reference to reviews of product from official, authoritative sources...

What else?