“ **Fitear To Go 334** It's very expensive, it doesn't fit the best due to its huge shell, yet I love it all the same. The sound is sublime. Normally I prefer dynamic IEMs for their weighty low end and texture that most BA earphones can't touch, but the tonal quality, transparency, and high level of detail retrieval bring the Fitear to the top of my list. The openness and...” --cn11
“ The PK3 is a great, warm earbud. It does vocals especially well because it is very mid-focused. It has impressive bass extension, not especially strong impact; the trebles are smooth and may roll off too soon for clarity and detail nuts. But the mids are what the PK3 are all about. ” --kmhaynes
“ These were my sweetest sounding head-gear yet. It would be brilliant all-rounder if it would not require a portable amp for portable use. This is the first reason i left it, otherwise i almost got an ear infection from those foams.., they get dirty in a few weeks of massive use. I recommend them to clean, i boiled them in water. ” --angevoi
“Check out my video review as well: http://www.youtube.com/watch?v=fiFd4lLINAk&feature=youtu.be The f111 is a beautiful IEM. Even with it's "typical" fit, the kind of fit you would normally use with this type of earphone, they sound great. They are warmer and less crisp than the etymotic er4s that is its cousin (they use the same driver). However, with a very...” --luisdent
“ Well firstly this is not a true iem. The sound is about as great as one could get from an earbud. In my limited experience and without trying the pk1, I would say these are the finest buds you can buy. With that said, these are not for everyone, this is a niche product within an already niche market. I find driving it with my D12 anaconda makes for a pleasurable sound,...” --Jamesdeandoa
“ Overall I have been satisfied with these phones. I would not recommend paying full price for them like I did. ” --Skoch
PK2 earphones are the low impedance version of PK1. Although not as good as PK1, PK2's sound signature is similar to PK1. You don't have to drive PK2 with an expensive head-amp. If you are looking for something with high performance/price ratio, PK2 might be the best choice.