I absolutely love my Manta! I've had it for a couple of months now, and it's been a beacon in office meetings and calls. I'll preload a CAD PDF into it and then take my notes directly on that in meetings w/ internal teams or buyers and then export it. This saves me so much paper and time running to and from the printer.
Also, I've already read 3 novels on it through the Kindle app. It's easy to maneuver and use and great on the eyes. I actually like that it's like an actual book w/o a back light.
Mine also has a couple apps side loaded on it now that I took advantage to get on there the 1st week of getting this. I side loaded Fire Fox, Aurora Store & F-Droid so I dont' have to side load more apps, and OneNote so far. I do not regret this purchase whatsoever! This was love at first sight.