Alesis Recital 88-Key Digital Piano Keyboard with Semi-Weighted Keys, 5 Premium Voices, Built-in Piano Lessons, Includes M-Audio Sustain Pedal & HDH40 Headphones - Perfect for Beginners, Home Practice & Studio Recording

I purchased this keyboard for beginning piano students. That is important as I will be judging this keyboard based on it meeting the criteria for a beginning student.I played through all the keys up and down and on all the select instrument options. I heard no rattling of the shell, very little clicking of the keys. It's solid and seems well built.The sound is not professional quality, nor even close, but it's good enough that it doesn't sound excessively fake. I did not like the other instruments (Electric Piano, Organ, Synth, and Bass). The organ sound especially doesn't sound like an organ to me, and is completely ineffective in the lower register. Same with the synth and somewhat with the bass. These are small problems to me, as the piano registers clear throughout the range but does seem a little faint in the upper register. This Alesis keyboard is designed to be a low-end professional keyboard, hence it doesn't have the myriad synthesized sound options that most keyboards have. However, at a professional level it falls very short. They should have just added more instruments anyway. My only regret is that my beginning students won't be able to play around with the many synthesized instruments that other electronic keyboards have.Others reviewers have had trouble with volume. I haven't encountered that yet. Still testing.The keys are springy, they do not feel like a piano at all, but they are much better feeling than most synthesizers. For a student practicing scales, arpeggios and other technical studies the instrument will serve much better than most keyboards. The fact that it is 88 keys is helpful, but not necessary for beginners. It's a plus.I have played some other inexpensive low quality keyboards, and so far this one is the best bang for the buck. I am happy with it, though I am thinking that it might be too expensive for a starting student. However, it meets all the criteria that I needed for my students, and so 5-stars.