I am thinking of buying it very shortly for around Rs:9.5k or $150 for our friends in the west, but does this still have the punch to stay relevent for atleast one more year from now? Development is kinda low so that's a point against it in my books. But the value for money simply can't be ignored.
And does Xolo do a good job in After Sales Service?
If it was me, I'd wait for the new Shield Tablet to launch (it will be soon,~3-4 months by the rumors) and then get the original Shield Tablet with the Tegra K1 in it. I'd bet the "Shield 1" drops to $199 after the new model launches.
I'll be buying the "Shield 2" with the Tegra X1 in it to upgrade from this tablet. This tablet is definitely a very good tablet, the main downsides are the amount of RAM (1GB) and the screen resolution (1280x800). If this tablet had 2GB of RAM and a 1920x1080+ screen, then I wouldn't upgrade for probably a year. 1GB of RAM is by far the most annoying thing about the tablet, I use at least 2-3 apps to monitor and keep that number as low as possible.
I'd hold off on buying a used one for $150, that isn't a good price, brand new is $169.99 at NewEgg.