Answers
A barter collaboration — free product or services instead of cash — can be worth it in specific situations and a poor trade in others. The honest answer depends on what you’d otherwise be doing with that content slot and what the product is actually worth to you.
Cash payment is fungible and doesn’t depend on you wanting or being able to use the specific product. Barter only pays off if you would have spent comparable money on that exact product anyway, or if the brand relationship itself has clear future value. Treat "free product" as a form of payment you have to value honestly, not as a bonus on top of your normal rate.
Whatever you decide, disclose barter collaborations the same way you’d disclose a paid one — the disclosure obligation applies to free product just as it does to cash.