How to get page one in Google with your review
You might ask how to research a product if it's not launched yet or it just launched.
Simple. Check their own website and get as much information as you can, and also see if you can join for free and have an insider's look. Many will want to read what others experienced before doing it themselves. So have the experience, research thoroughly and see the results.
Make a list of key features that you should talk about, pro's, con's, price, owners, and also see if you have a referral/affiliate link that you can share.
Even if it's a negative review, people will sometimes join the program/buy the product.