I will second this. I have listened to a number of high end amps, and the X3 while not the absolute ultimate, definitely holds its own in comparison.
'Phones differ. Personal preferences differ. Reviews are all well and good, but ultimately each listener needs to decide for themselves and not pay so much attention to what others say.
All we are saying is, try it first and maybe save yourself a ton of money. Afterwards if you are not satisfied, then get an amp.