Hi, the e-03 has done so far 150 hours...i did have a Audio Research PH5 before...no comparison! my thoughts are 100% with the 6-moon review...everything opens up...big staging, depth, dynamic, detail but not sterile, warmer sounding than the tube ARC PH5...mine are hook up to ARC REF3, thr a pair of custom valve monoblocks by Melody...speakers are Usher BE-20 with GR Research x/over.