Let me start off by saying, this device is 100% as described by the seller, and there were no "huh, well that's not what I read!" moments. This is a budget viewer, but is surprisingly well designed, and constructed. There is some room for improvement, specifically with the way the device grasps the phone.It's as stylish as you can expect out of a brick hanging off your face. It doesn't look bad at all, and the silvered grey and black color scheme is rather simple yet tasteful. There are three control knobs along the midsection of the device that fine tune both screen distance, and lens width. There are NO input options here as you may see with other headsets, this is simply a viewer. There is also no way to touch the screen once it is installed. Keep this in mind if your the type that wants to interact with your device while it's inserted. Moving further back, you've got a well contoured face opening, padded with what appears to be an imitation leather, or some kind of bonded or top grain leather if its in fact leather. No matter though, it is well stitched, looks elegant, and is comfortable as all get out. The strapping is comfortably wide to help prevent pressure soreness, and is elastic to allow for a snug yet comfortable fit. Jumping back up front, there is a removable cover that allows for both additional ventilation (I wouldn't recommend it, but you can indeed charge your device via two contoured slots on either side of the front cover) and for AR applications. Your camera placement may or may not be ideal for the provided cutouts; though if you're handy, you could easily cut or drill away some of the plastic to meet your needs.Construction wise, I'd say its pretty robust, the plastic components are similar to that of the plastic you'd see in a newer remote control for a TV or a bluray player. With the larger unsupported surface area though, don't expect it to handle any large drops to a hard surface with grace, at best you're gonna get some gouges, at worst, you're probably gonna need to dig out the super glue. No matter though, it's not built to be dropped on a concrete floor anyways, just be careful with it. The cover which holds your phone is kept closed with a magnetic closure, so far even with some rather spirited head movements, I have yet to have the phone come flying out. In short, I'd trust it to keep the phone retained.I've only got two issues with this device, and at that, they're pretty minor. First one is the mechanism for fine tuning the screen distance, It uses a rack and pinion style system to move the screen back and forth, but just from the top. On the bottom there are only two unsupported guide pins which allows for minor yet still noticeable angular distortion when looking up or down. I'd personally recommend to the DESIGNER to consider revising this system to include stabilization with, for example a Scissor mechanism.My second issue with this device is the manner in which it retains the phone. On the cradle's top section, there are two spring loaded grabbers, both with little fingers to catch and retain the edge of the phone. On the bottom however, you don't have any fingers, you've simply got two pads. These pads WILL hold onto your phone, as long as the phone is not inverted. Simple fix here is to quite simply, remove the pads, and move them forward a bit to keep the phone from riding the edge of them. Some devices may not experience this issue either. Again with the phone retention mechanism, I'd recommend to the DESIGNER to consider revising the system to include retention fingers on the bottom section as well, AND consider integrating a dual rack and pinion setup to self center the phone upon installation.In summary, this viewer is awesome. For it's price point you absolutely cannot go wrong, it's a simple viewer that does some simple tasks extremely well.I took the liberty to measure the device and generate a google cardboard QR code, scan this to adjust your cardboard app to this viewer.