On first sight the extension looks really flexible and appeared to be just what I needed - the ability to sell subscriptions to a magazine. However there are no instructions or tutorials. This is quite a complex extension with lots of options which is taking some considerable time to work out.
When anyone posts a request for instructions or a tutorial on the forum they are referred to a series of screenshots which do not explain what to do. This (and all their other) extension(s) needs a set of step-by-step instructions. Sadly without this or better support I cannot recommend this extension.