Well. We have 4 Mr Slim installed and one Mitsubishi heavy industries installed in our home. The slim ones are almost as old as 2003 but never needed a technician in all these yrs except normal servicing. .
As for assembly, I doubt its assembled in pak. Bcz when I went for survey it says made in Thailand on every ac and the dealer said the same. Anyways not sure what the real deal is. But still. Its the best no doubt.