First, I purchased this as "renewed" to save some money.  It arrived in the original factory packing that was never opened as the Microsoft packaging seals were still in tact.  Additionally when I started it up and finished the setup process, the surface app showed 13 months remaining on the 1 year warranty!  There was not a single sign of use on both the tablet and the packaging.... Score!So, I purchased this to replace my trusty, but aging Surface Pro4 which I used on a daily basis since the month it was launched.  My original had been replaced by Microsoft due to some screen issues but other than that, it was a great device. So, being the Tablet Geek that I am, a new surface device was a natural choice for me.I liked the surface book not only because I could remove the tablet from the keyboard but also because it has some pretty decent graphics hardware on board.  I have actually played around with Microsoft Flight Simulator 2020 on it and it runs quite well.  Yep, it does get a bit warm with the fan running at full tilt but it is very playable.Overall build quality is great.  Battery life has been quite good as well; not as good as my SP4 was when I first got it but enough for me to make it through the day.