I purchased my Duet from a local retailer, 2-3 yrs ago.  It worked well enough, if a bit sluggish (which I don't mind given the price), until about 1yr ago - then the keyboard problems started.  The keyboard would just stop working.  Lenovo has a help-page regarding this issue, but it didn't help.  Initially, I only had to wiggle the keyboard side-to-side and it would start working, but over time it no longer fixed it.  After trying all of Lenovo's suggestions (and many others), it seems fairly obvious there's a bad/broken wire somewhere in the flexible hinge of the keyboard.I can't say that the flexible hinge is a design flaw, but it sure seems possible - so I won't be buying any more laptops with this design.  I'd consider buying a replacement keyboard, but another issue has begun.So for a long time now, I've just used this as a tablet; which worked well enough till the last month or so.  The new problem is that it just freezes up.  I go to webpage, and the progress bar begins then completely stops.  I've run the tablet's diagnostic's cpu test and it occasionally (maybe 1 out of every 4 tries) fails, during the "stress test".  Given this issue, and that's it's always been more sluggish than I'd like, I'll also avoid Mediatek devices.So the most I can say is it worked well enough for 2-ish yrs.