It depends on the kind of 3D.
Active Shutter/RealD 3D is just plain a bad idea. It requires a super high framerate to compensate for the glasses rapidly shutting off one eye or the other in time with the movie, which rapidly alternates viewpoints in sync with the glasses. Of course that means that even if the glasses get a millisecond off, visual havoc ensues, so the video and the glasses are synchronized wirelessly, usually by infrared which can only communicate at a short range if the glasses are pointing at the IR transmitter. The constant shifting of images tends to cause headaches, and the 3D can almost never seem to pop out of the screen. Of course all of this is extremely expensive, too.
In other words, it's a total hack job that barely works.
Passive/Circular Polarized/IMAX 3D glasses are much, much better. They simply use two normal projectors at normal frame rates which use common lens filters to cause the resulting images to be broadcast in separate 'channels' (if you will) of light. The glasses are extremely cheap to produce and require only a thin plastic film in each lens to mimic the projector filters for the eyes so that the brain can process two unique images simultaneously. It causes no headaches, the resulting 3D can actually seem to pop out of the screen, and is just plain more comfortable and enjoyable.
All that is to say, the extra cost for 3D that uses the passive technology is totally worth it to me, but I wouldn't spend money on anything that relies on active shutter technology.
Active Shutter/RealD 3D is just plain a bad idea. It requires a super high framerate to compensate for the glasses rapidly shutting off one eye or the other in time with the movie, which rapidly alternates viewpoints in sync with the glasses. Of course that means that even if the glasses get a millisecond off, visual havoc ensues, so the video and the glasses are synchronized wirelessly, usually by infrared which can only communicate at a short range if the glasses are pointing at the IR transmitter. The constant shifting of images tends to cause headaches, and the 3D can almost never seem to pop out of the screen. Of course all of this is extremely expensive, too.
In other words, it's a total hack job that barely works.
Passive/Circular Polarized/IMAX 3D glasses are much, much better. They simply use two normal projectors at normal frame rates which use common lens filters to cause the resulting images to be broadcast in separate 'channels' (if you will) of light. The glasses are extremely cheap to produce and require only a thin plastic film in each lens to mimic the projector filters for the eyes so that the brain can process two unique images simultaneously. It causes no headaches, the resulting 3D can actually seem to pop out of the screen, and is just plain more comfortable and enjoyable.
All that is to say, the extra cost for 3D that uses the passive technology is totally worth it to me, but I wouldn't spend money on anything that relies on active shutter technology.