Pros A Complete unit in itself (no need for computer)... 1. Output to monitor/TV with HDMI 2. NFC transfer/ or by SD Card 3. WiFi 4. LAN 5. USB (not all devices are detected though) 6. View and then download in mobile. 7. Upload from mobile using WiFi 8. 1 tb HDD inside (which itself costs 4150 or more) Con 1. Little slow (4-5 GB SD data takes around 30 mins to transfer) 2. Little complex (not for people with little knowledge to technology) - as you need to setup WiFi/LAN, for mobile you should be in same WiFi and pics should be in DCIM folder only... can't transfer files other than pics and audio/video, backup to HDD is also complex, the manual said it will format the HDD before taking backup... and those file can be used only in Canon CS100 to restore and not computers. Conclusion: if you are Tech-savvy and getting this device for cheap.... go for it. It is very secure to store pics/audio/video as no other format is supported so no chances of exe/vbs/scr to get transfered (which might be virus to affect all image/audio/video files) Plus as you can't directly connect this to computer so again no transfer of virus from computer. The easiest way to use is 1. Put SD cards in the device to store all images/audio/video in HDD of the device. 2. Connect using WiFi (mobile and device to same WiFi), download canon cs app from play store to view all files in mobile and with option to download 3. Copy media files to DCIM folder in mobile and then only you will be able to upload them to CS100 device using WiFi to internal HDD of the device It has built-in algorithm by which it copies images just once, I.e. duplicate files are ignored. It has WiFi print option as well for people having WiFi printer