Sung-Ho,
I have an LH-Labs Pulse fi. While not having the balanced outputs as the Pulse Xfi does, it has the upgraded audio outs and the Femto-clock. You would be welcome to listen to it in my system if you wish. The single ended Pulse fi has the same signal paths as the balanced version and the sound is very similar. Since I have owned my Pulse fi I have not even considered upgrading again.
John