Yes the A series were indeed lighter, but the new M series are as heavy as any ive fitted before. Ordered an A series but ended up having a M series delivered because of the A's un-availability. Biggest dissapointment was the now lack of a decent Zoom that the old A's had in abundance. Fitted it yesterday in a hall situation but could not get a decent zoom so now have to move the ceiling mount back. Which is not what i bargained for. Has a 3D input option? future proofing?