For business-focused products I usually do a free time-limited full-access trial + paid subscription. For consumer-focused products I usually do freemium (limited version for indefinite use + paid subscription to remove limits).
Also, can you change the paid subscription cost yet? It seems once you set it there isn't a good way to experiment with different subscription fees except creating multiple subscription types with different costs.
You're able to change the subscription cost on the fly (I think; I haven't actually done it). The bigger problem is there's no easy way to do price segmentation. This is fine for my consumer product, but I may end up rolling my own payments setup for an upcoming business product.
I'm working on my next, which provides business analytics for Google merchants: https://www.simonmweber.com/2017/03/18/google-payments-cente....
My SaaS adds autoreplies to Google Chat and Hangouts: https://gchat.simon.codes.
You can find the business details in https://www.simonmweber.com/2017/01/09/side-project-income-2....