It worked for me this afternoon.. with plain gerbers.
Unfortunately I'm having a bit trouble of gerber/pcb doc import sometimes.
Sometimes gerbers aren't parsed correctly. For example, if I use slot and drill holes -- Altium exports to them 2 tool files, but Aisler's site only reads one.
Altium PcbDoc import does the trick usually.. but sometimes that fails to import outright without a clear reason why..
All in all usable but sometimes with a bit of effort.