The Yamaha Electone D-65 definitely takes some getting used to because of how many different parameters are features are available. No matter what your previous experience might be with keyboards like this, it will take you some time to understand how everything works on this. There are a ton of features in addition to the variety of tones, including rhythmic patterns, arpeggios, and all sorts of effects. I don't have a manual for the Yamaha Electone D-65, but it would definitely be a good idea to have one if you are going to seriously learn this keyboard.
The sounds on the Yamaha Electone D-65 are extremely varied and unique. I love a lot of the sounds on this, but they aren't too realistic sounding in terms of what they are suppose to emulate. However, this makes for a cool in between sound that can be used endlessly for creative purposes. The feel of the keyboard is great and the instrument is very easy to play overall. The Yamaha Electone D-65 is quite versatile, but all of the sounds have a similar sounding quality to them and they all kind of fall under the same umbrella or sounds. Overall, a lot of awesome tones can be achieved with the Yamaha Electone D-65.
I've been using the Yamaha Electone D-65 for about two years and I've found it to be a very cool little organ. There are some great sounds that are suitable for recording and live shows, but since this thing is so huge I wouldn't recommend bringing it out of your studio or home. This is one of the best models of the Yamaha Electone, and it is definitely worth a try if you are familiar with the Electone series and like what it can do. All in all, the Yamaha Electone D-65 is not one of my favorite Electones, but it is a worthy model and has some great features to it.