i'm using a 114mm reflector (4.5")-weighs about ~6 w/my hyperions) doesn't cause an issue. uses a normal vixen (i think) dovetail mount, just adjust for balance- loosen left nut rotate scope til horizontal, let go, if drops to rear, slide dovetail down, if drops to front, slide dovetail up, until it remains steady when released, tighten nut, once you have rotated the scope to vertical you are all set, i did it this way, and i have not had any problems with stability or goto once alignment is done.

your results might vary, but i like hte cube and will most likely upgrade to a minitower if and when i move up to a heavier tube -i also have an 8" dobsonian scope that is my main viewing telescope now.

oh ya, don't forget to change the time and your location in the cube, it's set for china by default if i remember correctly.