Purchase V.2 on Ebay http://cgi.ebay.com/DUAL-AMP-portable-headphone-amplifier-V-2-/140452042344?pt=UK_AudioTVElectronics_HomeAudioHiFi_Amplifiers&hash=item20b3981668#ht_4308wt_ 1107 Order with AD8610 op amp option in July 2010. Neco is an excellent seller good communications and timely shipping. PACKAGING: the V.2 was packaged in a bullet proof configuration. BUILD QUALITY: the V.2 is built like a tank superb finish and quality feel, with Neutrik female mini female jacks. SOUND: Started noticing improvement after 50 Hr burn in, reached max performance at about 100 hrs. Overall sound is very neutral all frequencies with a very tight and deep bass. The sound stage is wide and deep with excellent instrument separation.I used Shure SRH840, Sennheiser HD595, Sennheiser HD600. Source AloSony D25S line out with ZXAC " SCS mini cable. The listening experience is like listening to a high quality desk top headphone amp. I compared the performance to an Ibasso Toucan PB1 and I prefer the Neco V.2 due to it's natural, neutral presentation and superb soundstage. I highly recommend this amp. The battery life appears to be over 20 hrs with normal playback.