Yamaha • DX-21

A consumer level DX synth that sounds just like the DX-100 - thin and brittle. Following the DX model this synth also uses FM synthesis which is difficult to master. You will need to program this synth to get better sounds because the presets are only moderately useful. It's capable of a good string, bass and droney-pad sound as well as industrial sound-effects and metallic like sounds.
Still it makes a better option than a DX-27 or DX-100 because it has the capability of layers and splitting the keyboard and there is a chorus effect. Portamento and a Unison Mono-Mode are also nice features for screaming lead synth performances. For a cheaper source of DX sounds with moderate programmability, check out the DX-21. It's been used by Hardfloor, Level 42, Brother Beyond, Astral Projection, Technotronic, Vangelis, and Norman Cook (Fat Boy Slim).
This was a very versitile keyboard for me in my high school music class, and brings back good memories.
I think it makes a great keyboard, and even though it may not have the most realistic of presets, it's still a hell of a lot better than all of the negative press it's been recieving.
Fat Boy Slim used this synth? I do like his works very much!
It will not sound professional if not USED in a professional manner. Take any synth with cheap sounds and use it correctly, it will sound fantastic. FM synthesis is a good way to bring in lively tones into any modern style of music, like hip hop and rap.
I can be 100% honest, this synth has the most vibrant sound of any modern keyboard I've ever tried.