I have owned the 1517vsm for about 2 years now.  At first it seemed to perform well.  I cleaned the filter weekly even if the filter light wasn't on.  Then over time, it seemed like the different fan speeds seemed to slowly all be the same.  I get the same output whether I choose F1, F2 or F3.  Therefore, it doesn't move enough air to cool properly and ices over constantly even if I don't set the temp too low.  They said to clean the evaporator, which I did and no difference.  I then had it professionally done.  It's looks really clean and the tech said it was good to go.  But still doesn't cool or perform as well as an older, much smaller, much cheaper unit we have in another bigger room.   If the fan speeds were representative of the display, it might work better.  Too bad as this LG cost a lot and I really wanted to like it.