Lately, I never even bother looking so much on positive reviews of any service. Instead, I do the reverse, checking out the negative and critical reviews. A legit service will have a dozen folks complaining about simple issues that can get resolved.
If a service has only 5-star reviews that were made at a particular period, then there is something wrong with the reviews.
I do the same all product and service sites will only post everything positive and good about their products and services on their homepage, buying positive reviews is very rampant on the internet, especially on review sites like Trustpilot, so to get the real picture on how good and how bad the product and service is, check independent review sites with cons and pros, not coming from review sites with affiliate links on the products and services they are reviewing.