I like that it is easy enough so you don't need much help getting started with prototyping your app ideas or even just working out how something works before building anything! It's free too which makes using this software very affordable compared other similar tools available such as Adobe XD etc - The only issue i have noticed at times when trying things quickly (ie creating an intro page) sometimes gets stuck/stays blank until restarted but not sure if thats down do me rather than protogoide itself? We are currently making changes / design improvements within our website by adding new pages & functionality where we can see what customers would be looking through while they use their mobile devices online e-commerce type products.