Surely a good way to discover new things, but don't expect more honesty than with the Japanese reviews.
If a tout is not affiliated with a specific shop, they will take you to an information booth, ask your budget and give you options of available girls from various shop.
Worst scam I have heard of was actually to a Japanese guy, the tout made him pay once at the information booth and then he was asked to pay again at the soapland and he did. The kicker is that the guy was an ex cop from another city, lol.
But also often they offer high class shop girls at a discounted rate if it's quiet. So don't expect you will have to pay more because you use a tout, they can actually fix a rate within your budget for you.
That said, they will probably not be too pleased if you just ask around for information and don't pick any girl.
And as for advice on girls, I doubt the non affiliated touts know what the girls really look like, and the shop staff guys may very well not be honest with you about looks and service level.