From what I've read about and reviews I've looked at performance wise is exactly the same because it has the exact same guts. Aesthetically though, there's several things you have to consider. I think View Profile: billherbst - E-Cigarette Forum explained it best.
"Because the wall of the tube is 1/8 thick, the diameter of the Acrylimax is about 1.0, or 1/4 more than the V/Zmaxs .75 width. Its also longer---5.25 versus the V/Zmaxs 4.6. This is a big mod, no question about that. Finally, the device is a bit lighter than my Vmax V2. Weight with batteries installed is 3.60 oz. for the Acrylimax versus 4.15 oz. for the Vmax."
"although the threading of the metal bottom cap is smooth, the interior female threads are just a ring of metal that is press-fit into the bottom of the acrylic tube, with a shielded wire extending down a groove in the tube from the regulator board to make the ground (negative) connection. Within two hours of my putting the Acrylimax into service, the inner thread ring started to slip out from the tube, pulled out by the pressure of the spring on the battery when the bottom cap was screwed on. I pulled out the inner thread ring, applied a thin film of super-glue, and pressed it back in."
"Also, the tube, which has a wider diameter than the metal end cap, is cut off flush at the bottom, so theres a sharp edge of overhang where the bottom cap meets the tube."
"The firing button (really just a cover for the switch on the regulator board) rattles when I shake the Acrilymax. Unlike my Vtubes, however, the Acrylimax firing button is much looser (it shakes visibly in its hole) and rattles more loudly."
All in all I agree with Billherbst, despite a few aesthetic issues that can be touched up easily for a cheaper price tag around $50 less.
"Because the wall of the tube is 1/8 thick, the diameter of the Acrylimax is about 1.0, or 1/4 more than the V/Zmaxs .75 width. Its also longer---5.25 versus the V/Zmaxs 4.6. This is a big mod, no question about that. Finally, the device is a bit lighter than my Vmax V2. Weight with batteries installed is 3.60 oz. for the Acrylimax versus 4.15 oz. for the Vmax."
"although the threading of the metal bottom cap is smooth, the interior female threads are just a ring of metal that is press-fit into the bottom of the acrylic tube, with a shielded wire extending down a groove in the tube from the regulator board to make the ground (negative) connection. Within two hours of my putting the Acrylimax into service, the inner thread ring started to slip out from the tube, pulled out by the pressure of the spring on the battery when the bottom cap was screwed on. I pulled out the inner thread ring, applied a thin film of super-glue, and pressed it back in."
"Also, the tube, which has a wider diameter than the metal end cap, is cut off flush at the bottom, so theres a sharp edge of overhang where the bottom cap meets the tube."
"The firing button (really just a cover for the switch on the regulator board) rattles when I shake the Acrilymax. Unlike my Vtubes, however, the Acrylimax firing button is much looser (it shakes visibly in its hole) and rattles more loudly."
All in all I agree with Billherbst, despite a few aesthetic issues that can be touched up easily for a cheaper price tag around $50 less.