Hi. I just bought the one that Britaudio was selling here on audiogon. Peter Q at audionote recommeded that it'd be a better match for my Voyd Valdi TT than the SME V I just installed this past weekend - gonna try it out, and hopefully save a cpl of thousand bucks. Guy Adams (of Voyd) worked closely with Geoffery Owen (of Helius) when he built the tables, and there are supposed to be a "perfect match". Anyway, from what I can gather, the ARM3 is probably an extension of the Helius designs. Here's what he sez about the AN-1S tonearm:
http://www.audioasylum.com/scripts/t.pl?f=vinyl&m=117453
Samir.