I purchased this while it was on sale for $39.99, I waited to write a review until I had a chance to test it with the SD card I purchased as well. The camera works very well. Smooth tracking and good quality picture so far. I purchased the SanDisk 64GB microSDXC UHS-1 Card with Adapter.The card seems to function well with this camera. After much googling it appears the only consensus is that this camera should use a class 10 microSD. Otherwise this one seems to do the trick.I like the wifi function with the XDV app on my phone. Gives extra freedom to an already mobile and very portable device. I will say the protective case has already come in handy. Not 10 minutes after opening the package I dropped the camera from my lap onto my hard floor. No damage or functional issues noticed after extended testing.It took me a while to figure out how all the attachment pieces worked but I think I have them all figured out now and am excited to give them a try. I purchased this to serve as an action camera while hiking as well as a dash cam for my car. I have not had opportunity to test it within my car while driving but I have tested the driving mode and it seems to be functional and working.Having used a gopro in the past this seems like a more cost-effective alternative for the average person.