Has anyone tried the various apps out for utilizing your iPad as an external/second display on a PC/Mac? I'm actually more interested in the PC-side, as my work laptop is a Dell. I often travel either to my office or a client site, and could really benefit from an extra display. Lugging around a monitor isn't very feasible. I've been looking at reviews online, and they all seem really 50/50 on these apps. Some complain the text is so small on Retina-enabled iPads that it's not worth it, some say there is noticeable delay in response time, etc. Just looking for some real world experience. Also wondering if any of these apps allow you to change the resolution on the iPad, and if it's all pixelated after that or not. My main uses would be for referencing spreadsheets, but also would like to have a VM running or even a PDF to reference while I'm editing in Word on my main laptop screen.