You can talk about potential issues with consumer electronics, but the fact is that a lot of people (frankly, seems like vast majority) fly with iPads or mounted cellphones and we never see a failure. (iPads can overheat, especially during daylight, but they have coolers for it, as obviously will Hill.) So clearly they work. They are not suitable as a PFD (something called a real-time operating system is required for that, among many other considerations) but as a MFD they're just fine.