Audio Craft AC-4400 and related AC tonearms


I have so many Audio Craft headshells that i start thinking about Audio Craft tonearms.
Something like the Audio Craft AC-4400 silver color with removable armwands.
Must be a high quality tonearm, Japanese classics. The problem is that i’ve never tried them.
Anyone can comment? Would be nice to read more opinions.

Here is a picture of the AC-4400: https://i.ebayimg.com/images/g/oNcAAOSw0HVWADXg/s-l1600.jpg

There is also AC-3300 model: https://www.vinylengine.com/library/audiocraft-ultracraft/ac-3300.shtml

128x128chakster
They're unipivot. You want to mess with that? These are the tonearms that Graham fraudulently ripped off.
But what's the difference between AC-3000 vs. AC3300 and AC-4000 vs. 4400 ? This is where i'm lost.  
Thanks, invictus. I never appreciated the obvious similarity between the graham design and audiocraft tonearms. Seems the latter are quite advanced.

Some notes, possibly obvious:
- AC3300 & AC4400 are later, more advanced models that command much higher prices (~3-5x) on the used market. I think they were manufactured until the early 2000s. 
- AC3000 & AC4000 are unipivots and AC3300 & AC4400 are "double point support", but I haven't seen one in detail, so I'm not sure what exactly that means.
- AC3300 & AC4400 have VTA on the fly, I believe, but the other features are similar. They all have adjustable silicon oil damping.

[Purely subjective assessment made with a limited number of cartridges and not in a fully controlled or blinded setting:] I have AC3000 & AC4000 and quite like them. They have an open, easy, refined sound compared for instance to FR64s which has a solid, full-bodied sound. I like having both and use AC4000 for chamber & choral music and FR64s for orchestral & jazz.