Wow.After I plugged it in, it fired up.  No problems.  Out of curiosity, I loaded my tax software.  Quantum handled the program with ease.  Because of space limitations, I removed the program, but the device could handled everything quickly.I upgraded to Windows 10.  No problems.  Zero.  A few minutes passed, and the Quantum was operating under Windows 10.Once day, access to the tablet disappeared along with start up apps, etc.  I call Quantum, and Chris tested everything on his end and determined the problem was on Microsoft's side of the fence.  I called MS, the tech fixed the problem.  I followed up with Chris and thanked him.Conclusion:  the device works . . . fast.  Windows 10 upgrade is painless.  Support was stateside and fast.This computer and the related support exceeded and continue to exceed my expectations.