Ok for nature stuff but still gimmicky. I noted that my 3D blu ray seems to suffer from 'dropout'. While watching the Hobbit in 3D, the image 'wobbled' every now and then. So I took the specs off and saw the double-image suddenly 'merge' into one for a split second. This, when seen through the glasses, makes the image appear to wobble and lose depth for a second. I thought it may be the disc but later my 3D Star Trek Into Darkness disc did it. Obviously the player, which I had fixed but now it's started to do it with a Dr Who disc, but oddly, not my 3D disc of Gravity. I still think 3D remains gimmicky and prefer a good movie in old 2D. I have a 'smart' TV which you can surf the net with. However, the browser software is a very cut-down version of that on a PC and needs updating periodically.
If you must get 3D, go for the passive version as it's the same as in the cinema. Specs are cheaper too and I take mine to the cinema to save money on tickets. I have also got a clip-on pair for spectacle wearers.