It's sturdy but a little heavy for me ... (I plan to disassemble the HP allger for a few pounds! [done])
The manual is not always complete, but fortunately the dialogue forum are there to fill the gap. The arranger is not a synth so the edition of sounds is not possible if only adding effects (reverb, chorus, delay, distortion ...)
Programming is simple, as the entire range KETRON.
I use it since July 2008 and this house every day and almost every weekend on stage.
I used a range of keyboards and arranger DIFFERENT marks my last silent KETRON XD3 (I sell elsewhere because of duplication [sold])
This type of machine still seems too expensive compared with his counterpart piano keys!
The sounds are very good (but it's not a synth!) I regret only a few small bugs that will soon j'espre rsolus with the next update of the software [still expected in 2010] !
This keyboard has been designed to the scene, the ergonomics are good, well thought, styles sound very real and we can easily add ...
I would do this choice because today we have no choice!
It does not availing oneself of USB connection, which is a shame, especially for the management of its hard drive via a PC. It is equipped with a serial connection (very slow) but fulfills its function.