Given that this keyboard is alleged to be of a similar quality and capability (in terms of features and settings) to a yamaha psre423, amazon is selling it at an incredibly good price. Mine arrived a few days ago, and on first impressions it seems to be of a very high quality. I particularly like the workstation functions like the arpeggiator. Personally I am of a decent standard at piano, but not great - I have passed grade 5. If you are of my standard this keyboard is more than good enough and I am sure it is equally capable for even the most accomplished of pianists, though bear in mind that it only has 61 keys. Therefore if it is a digital piano you are looking for, at a similar price, the yamaha np30 and np31 seem to be popular with reviewers on amazon and would be more suitable. I am no expert sorry, but given that no one else has done it, I thought I should review this keyboard to let you know it is a quality product and that there are no obvious problems with it.
By the way, I haven't tested the midi function yet but I'll try to update the review if I can once I have tried it. I hope this helps you.