Yep - sure thing, The review unit is supplied by the manufacturer totally free of charge - and all they expect is for me to review it. There are no expectations on the review being positive or negative - they get no say at all with how I review it. It's my honest opinion.
I work a little differently to most other reviewers though - in that I have contacted all the manufacturers that send me review gear with following understanding:
Unless I buy it, I always consider the product their property
I'm more than happy to return all equipment following a review - as long as they pay the freight in getting the goods back, I used to do this myself for a few guys - but it got too expensive (the freight) as I got more popular.
If they choose to leave the gear with me (for follow up comparisons / reviews), then I am more than happy to keep it here in pristine condition with full packaging etc - and always happy to return it if they ever want it back
So I never regard the products as mine. They aren't freebies - as much as loaners. In reality most manufacturers now leave me with the gear. It is helpful for comparisons at later dates - and because I get so many questions (following the reviews) it's helpful to be able to refer back to the actual product to answer them.
The other reality is that when I'm listening for relaxation - most of the time I'm actually using my own bought and paid for gear. And I try (funds allowing) to always buy anything I consider exceptionally good that I intend using privately. My last purchase was the Jays q-Jays (I could have kept the review unit, but I insisted I pay for it because I liked it so much). My next will likely be the Fiio X7.
My other main listening equipment is mostly bought and paid for (or occasionally prizes won in competitions) - including iDSD, NFB-12, LD MKIV, X1, E11K, X3ii, Alclair Curve, Adel U6, q-Jays, HD600, T1, QC25 and a lot more I can't remember - like the A83, Altone 200 etc.
Basically I like to remove as much potential bias as I can when I'm reviewing. If I regard it as simply borrowed, then there is reduced potential for making reviews overly positive.
Cheers
Paul