Chul Hee:
You might as well hear from somebody who owns a Prima Luna ... well, two Prima Lunas to be precise ... the Prologue 2 integrated and the Prologue 5 power amp. I went with both the P2 & P5, because they have better parts and they gave me the options of using different tubes.
The KT 88 tube has warmth and gives you both midrange and bass. The bass is tuneful and it has oomph, as well. I used the P2 originally with Omega Super 3 speakers ... high sensitivity, single driver monitors and was glad that I had the extra bass reinforcement.
Regards, Rich