Well Harish,
6400 series is mid range feature rich pack. I liked its browsing speed over WiFi. Opens Very Fast. Couldn't connect to WiFi direct to my mobile (Galaxy S Duos). Have to explore more. 3D is good. Very effective when i watched Samsung 3D magic clip. Only problem I observed is as Glasses are active type, it takes at least 15 Sec to adjust properly. If surrounding lights are off, it gives better picture of 3D.
SD video is good enough. I am very happy to use videocon d2h. HD is much better. I can identify spots on many models' face while watching in HD..
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It has a facility to control external device through IR cable. Means, if you have other STB, DVD player then select the make & model in your Tv. Connect your IR cable (supplied with TV) and with change in TV remote, STB / Disc player function will also change. However I couldnt change my d2h STB as new d2h STB operates on RF remote. This TV generates IR signal. :sad:
Playing movie through HDD is fast. I connected 1TB Buffalo HDD. Plays all format. It remembers the position when exit the movie from middle. Forward & Reverse are controlled by sliding on Touch area of Rmeote. No lag observed.
There is a picture off option to listen music. But this option is not available if you are playing from USB. Sad as you store music in your pen drives only.
Didnt like the TV power chord. Looks a little cheap but hardly you notice once installed.
Most TV connectors and I/O are side and back of TV. Once Wall mounted, I found it difficult to acees easily. So connected 2 USB extension to manage mounting USB devices.
While browsing content from HDD, menu transition became a little slugglish. Could be due to capacity of HDD. But its not worth of a concern.
My wife and baby are very happy to watch TV with its picture quality.
Sound is really great against as I expected by going through other reviews. You can notice Bass, Treble & crisp of Sound. Ultimately its pleasant.
If you want to buy this TV, make your decision fast. Due to falling Repuee, TV price will soon go up. I had to pay 2.5K extra coz Rupee climbed from 55 to 60. on 14th (I booked on this date), Rupee was 62.6. Now its near to 66. So soon Samsung will revise its price again.
If I find any more features or issue, I will update here.