Square Taper or Octalink ?

Despite the good reviews for octalink, i decided to buy the DA 7600's. I dont know why, probably because it's a system i'm used to. I bought them fairly cheap from an ebay shop - Australian ebay. Guy who runs it is called Alex-Japon. the shop's called something like; buy direct from Japan. Anyone heard of it?

Got a frame, rims and other stuff from him in the past - no problems at all!
Everything is sent EMS so you can track it - had stuff outside ebay as well.