Top positive review
Delivery of the product was on time!
27 December 2018
Well psr e463 being a 2018 model compared to psr i455 which was a 2012 model, has a lot more features & overall better sound quality (e463 has two 6 watt speakers compared to i455's 2.5 watt Tweeters). Now if you're focused on playing Indian music then pick i455 as it has more Indian sounds. This keyboard is tuned more towards western music but still there are some indian sounds.
Following indian sounds are present in both i455 and e463 :
Harmonium 1 - Single Reed (216)
Harmonium 2 - Double Reed (217)
Harmonium 3 - Triple Reed (218)
Sitar 1 (220)
Sitar 2 (222)
Following indian sounds are present in i455
but not in e463:
Sarangi 1 (005)
Sarangi 2 (006)
Following sounds are present in e463 but not in i455:
Sweet! Harmonica (037)
Multi Saw Bass (059)
Deep Sub (060)
Sweet! Trombone (110)
Sweet! Classical Flute (135)
Plus many more sounds unique to this keyboard but haven't gone through it all.
Note- e463 has quick sampling option which technically can arrange any sound in a chromatic scale & play it. Haven't tested it yet.
Note 2 - For warranty, directly register your product on yamaha india website with the 'serial number' that comes with it. Also keep the invoice with you as additional proof.
Note 3- Either of the two (e463 & i455) can be used to take trinity music exams but till grade 5 only. So if you're serious about playing paino, better go with a 88 keys (has full 7 octaves) keyboard or digital piano with weighted keys (weighted keys are important to develop proper technique). Yamaha p125, p45, dgx 660(it's a keyboard with weighted keys so feature rich), Casio px160(most value for money product in its range), ronald fp30; any one of these is a good one time investment for learning piano properly.
Update : The successor to i455 is now available on Amazon, by the name i500. Basically it's a Yamaha e463 with more Indian sounds & styles.