3. JA's measurements of new gear,
4. reviews that go into detail about the piece itself, such as how it is constructed, parts used, and design information, all without undue hype,
5. the many pictures included with 6-Moons reviews, especially those of the insides of the gear.
Mitch2
Those are on my list also, especially love the pics on 6Moons. Another important piece of information is how the unit operated. For example, was the amp noisy, or did it have a finicky volume control.
I have made purchases based on reviews or get a high rating in Stereopile's recommended listing and been sorely disappointed. Have also been happy with gear purchased that way.