Pros: Everything. Soundstage. Transparency. Depth. Size.
Not only is Ray a great guy to buy from & deal with, he makes an outstanding product. The Shadow is everything he says it is & more. Extremely transparent, it doesn't color the sound at all. It gives your IEM the energy & power they need to spread their wings and FLY.
Paired with my Westone 4, which are already pretty damn amazing, it opens them up both spacially & soundwise. It gives depth & more precision to the soundstage, & it gives the music that much more depth. It's the difference between listening to an amazing pianist in the front row with the pianist facing you & on a stage & being there, not crowding but intimate, with the piano open. You can feel the pads hit the cords, you can feel the sound from the soundboard.
The only complaint I have so far is there is no memory for the digital volume, so it defaults whenever you turn the amp off.
Value is always subjective, but if you're reading this review than likely you are already considering spending around $400-500 on an amp. If the music is worth it to you, then this is a very good bang-for-your-buck.