Well worth it @ 537 and I did put them in myself. The boards are real easy to get out. I done this yesterday. Really opened up the top end, dynamics are a little better, the micro dynamics is where it really opened up. Tightened up the bottom end especially in the mid bass. I was skeptical about how much better they would be but I am blown away, like night and day difference right off the bat, not pun ;) Next I will put them in my VK-5 but that will take someone with skill, ganna send it to Music Technology or drop it off if I can get by there.