I'm speaking from the top of my head here... But I don't think there is any such thing as a "new" Hobart Cyber Tig.. I believe Hobart stopped making large GTAW power supplies when Miller Electric swallowed them many years ago.
Cybertig is a Transformer Rectifier power supply with square wave balence control, some have a pulsation option.
My experience with them is that they were poor power supplies for GTAW of aluminum... Rheostats going out, circuit board failures and other maintaince related problems along with very poor HF arc starting no mater what was done with the points... These Cyber Tigs I'm talking about were purchased in the late 1980's at about the same time we purchased Synchrowave 250's. The Cyber Tigs were phased out in about 1996, they Synchrowaves may still be in service for all I know.. They were in 2003.
The Cybertig will draw quite alot of power just sitting idle and more when you weld....
Nothing wrong with a cheap machine... but......
Caviet Emptor!