I have a passive 3D one because the idea of paying for all those glasses for sporting events made me crazy, also the first couple TVs I tried active on it could see extra cross talk and flicker for sure. These were expensive TVs also.
I never tried a DLP in person though.
With Oled right around the corner I can't imagine looking at one now though.
We didn't pay that much for the glasses - Fry's had a set on clearance, and we got both glasses for about $50 as I recall. Which, compared to some of the Samsung, or Sony sets I have heard about, is pretty darned cheap. On Panasonic, Sony, and Samsung sets, I could clearly see the flickering, but more often than not, it was with equipment sitting next to the TV, something that wasn't in Sync with the TV. The Mitsubishi DLP has been extremely nice, with no flicker, and minimal crosstalk. Noting of course, that even with passive sets, there is a certain amount of crosstalk (as you cannot avoid it all). The Mits glasses have decent enough contrast though, that when we kill the lights for a movie night, we can truly enjoy 3d movies.
With OLED's, I am not worried about getting one of them for about 10 years. Probably more. Plasma took about that long to get to a price reasonable enough for the common man, and OLED is starting out at about the same extreme. For now, I think I can wait.