I booked the Tune after reading good reviews- what I hadn't realised was that there are two Tunes and I got the wrong one! Although the guy on reception was helpful there really are not great views to be had. I could see arrivals as dots and 33 departures if I was quick from the 5th floor room (579) - but it's not recommended. Make sure you book the Tune Aeropolis and not Tune KLIA2.
