Passive 3D TV
Are MUCH better- we have a couple of JVC 46" TVs with REALD cinema glasses, much better brightness, colour and picture than active sets. Only problem is that they cost about 5grand.
The reason makers like the active sets is that there is no real change from a standard 120Hz TV to an active set - other than flogging you a 100quid transmitter ad a few pairs of 200quid glasses.
ps. If you don't like the early 60s Michael Caine, cinema glasses - there are a bunch of companies that do fashion versions, even clip-on sunglasses style if you wear specs.