Not sure I can be overly helpful but having owned a couple of ACG basses I can give you my Impressions. Firstly, ACG are very well made, use some nice woods, have some enterprising design features and are built to last. Secondly, they have a flexible pre amp, good range of sounds and can give you some tones reminiscent of other notable basses. However, some of the design features do take a little getting used to. The asymmetric neck is slightly odd at first. It does take a little while to get used to this feature and, if you only play an asymmetric neck then fine. For me moving from an ACG to another bass felt distinctly odd. Some of the fretting positions on an ACG tend to nudge your fretting hand into a different position to that when playing a more conventional neck. The ACG pre amp can be difficult to alter on the fly. It is a very sensitive pre and I found you tweaked the pre to a setting I was happy with and then had to use the pan control to alter the sound via the pups - obviously not possible on a single pup bass ;0)
The weight of the ACG basses is, to me, a major issue, as I have found the couple ice owned to be on the heavy side - I must stress that these were not custom builds and I'm sure ACG would build a lighter bass on a custom job. A long stint with the ACG was, for me slightly uncomfortable but that is my personal issue and not a fault of ACG. Aesthetically, some of the designs are interesting and, depending on the type of body shape you are used to, some of the ACG shapes are more comfortable than others - again a personal issue. Having owned two ACG basses and played a couple more, would I buy another? No. But, again, as with all basses, it is purely subjective. I'd strongly recommend trying some of the ACG basses for yourself as I think that is the only real quantifiable way you'll find out if they are for you or not.