I hate active, it's yesterdays technology with problems. Take the warnings seriously. I get a headache from the flickering and it also looks jerky to me because of the flickering. If you don't look straight on by tilting your head, the 3D breaks down. My step mother can not watch it because it makes her sick to her stomach PLUS gives her a headache. She absolutely CAN NOT WATCH an active 3D set. We watched Avitar at their friend who has a Samsung 8000 LED LCD series active 3D TV and the 3D picture was really irritating and bad.
I initially didn't like passive because I could never focus on the picture but that was the fault of the salesman. Their active displays had the glasses tethered to a stand at farther distance, but their passive display just had the glasses in a holder that you simply pulled out. Plus their passive display was situated on a walkway where you were somewhat forced to look at the display at a close distance. With passive, you must stand back 2X the distance of the screen size or you will not be able to focus on it. Once I did stand back further than 8' (47" TV), the 3D display was breath taking with none of the negatives of the active displays. No flickering, no jerkiness, NO HEADACHE! Plus the resolution is 1080 no matter what the competeing active camp tries to lie about. One eye sees 540 lines, the other eye sees the other 540 lines. The 2 combine combine into one vision with a full HD picture of 1080 lines of resolution.
Our brains interlace the picture together just like our brains interlace a 1080i picture. Active is a progressive 3D where all the lines are there and duplicated in each eye, where passive is interlaced and the lines are combined from each eye.
Passive is the new 3D where people don't get sick from watching it and can buy glasses for $10 each or even less, opposed to a very expensive $100 each.
BTW, LG still makes active 3D TVs with the plasma technology. LG stated it's to expensive to make Cinema 3D (Passive) technology available in Plasma right now but as technology gets cheaper, they'll try to put it in their plasma TVs as well. So they currently make both active and passive and feel passive is the best.
For some who aren't bothered by the flickering and jerky picture, and who do not get sick from it, may prefer active since you can sit closer to the TV. As I said, passive 3D only works when the distance away from the TV is 2X the screen size, so 8' for a 47" TV.
If you sit closer than the 2X distance, you may see the black lines but they are invisible once you get back at least 2X the distance.
I actually hated 3D and only was going to buy my 47LW5600 for the better IPS panel, local dimming, and smart features. I really didn't care about 3D. After reading it's manual online and finding that I wasn't standing far enough back to let the 3D image function correctly, I gave it another go and was really impressed in how great it looked.
I originally thought both passive and active 3D technologies sucked and didn't want anything to do with either.
Look at both and make up your own mind, it's the best thing to do. Look at all vertical and horizontal angles with fast motion scenes and see what looks best.
Unfortunately most stores don't have a Passive 3D setup. In my area, Sears and Best Buy only has active 3D setups with Samsung and has no passive 3D setup. H.H. Greg has active and passive 3D setups with Samsung, Panasonic, and LG. Walmart has no 3D setups at all, and sells no 3D TV individually. They do sell the LG 47" 47LW5300 1080P resolution LED LCD TV/Blu-Ray player 3D bundle and a Samsung 51" 720P line resolution Plasma TV/Blu-Ray 3D bundle. They have no 3D glasses in store though.