Hi, i currently have a HZ45 type shen hao (4 years old) and was wondering if the TZ45A is more stable better produced. Some things like alignment of the back is somewhat simple, the front lenspanel is somewhat flappy with a heavier lens. All knobs are made of plastic. The back insert holds the sheet holder with two parts of metal plates bend, i saw that the back of the new type has a bettre construction such as the linhof back to hold the sheet holder in position. Are there any users of the older HZ45 type who moved to the TZ45 version? I would like to hear their opinion.