I currently have the primo 8 and have had them for a while. They are a fantastic IEM at 200 and under. They are balanced with good midrange, nice bass and extension for older quad BA IEM, detailed and yet smooth treble which is very easy to listen to, and finally good imaging. I have yet to hear the new kc07 but I owned the k06 and they were great for the price back then, but i have not heard these so I will give you feedback on what I do have. The primo 8s are a great price and I believe were 99 around christmas time which is fantastic.(just checked on amazon and they are 98 like new condition from them... seriously. I would pick up another pair if I hadnt broken the bank on my mother's dog's vet bill.) So read some more if you need too, check around but for 99 dollars like new I would go for it and be happy.