I've once compared Shozy Cygnus and Crow Signature prototype. Overall i think their sound signature quite similar. Cygnus has better micro-detail, layering, and depth. Especially in micro-detail, cygnus one of the best in the world of earbud. In the other hand, CASE has slightly better bodied...

Mine is little bit less than $300. Including service fee, direct material, and overhead cost (local shipping). My T50RP unit cost around $90 but with poor initial condition (imbalance, deflated stock pads).

Besides modding earbuds like Monk CASE mod, Crow audio also done modding for some of my headphones. My Fostex T50RP, Yamaha HP-3 Vintage Ortho, and Grado SR60i are modded by Crow Audio. This guy is soooo talented. My personal favorite is Fostex T50RP Crow Audio Mods. The best low freq quality...

I've tried this amp which brought by mr. Asep from Dontblameyourears (local audio store in Jakarta). Well, paired with my planar headphone (Fostex T50RP modded) and high impendance earbud (Crossroad HR-1), this little tiny amp is rock solid and can deliver some nice sound for even my planar ! Wow !