The development of the Cashy-POS cash register for iPad took several men-years and there is a lot of know-how in this iPad app. Also we will continue to develop the functionality of this app and as a user of the full-version you will benefit from future updates with exciting features.
Compared to other cash-register software it is a one-time investment. Have a look to our competitors and you will see, that similar products are asking a monthly / yearly subscription.