I've used Doc's to Go for a very long time and since I got a paid version I always put it on any new device I get.. Also I got Quick Office when it was the free app of the day at Amazon. Both do the same thing so I feel it is more a matter of what you like. If one came pre installed,on your device then save the money.. If you have already had one on a previous device then put that one on your new device, and it shouldn't cost anything. For those that don't already have a good office app on the new or a previous device to bring over then I mention "KingSoft" office as an alternative, and it is available for free in the Play Store, it has over 5000, "5 star " ratings.