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My old M1438S would work clear and fine but unfortunately, mainly when I switch it on, it often requires some small strokes to stop the image to go up or down. Then it can stay hours and hours swithced on without any problems.
However I used it for many hours and for many years.
Though at a very good price I had a bad bargain on e-bay where I bought an M1538S. It has a the same external sizes of the 1438S but it is 15". This has the problem that the image is too dark and command to modify it is broken. Sigh!
I'll try in the future to find someone able to repair both them.
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