A Full size Piano Keyboard is a keyboard with keys of standard width and length. This is what all the keyboard players use, on stage or in studio.
Beginners, especially kids, begin learning on mini-keyboards. Reasons being, kids feel comfortable playing on the smaller size keys, since it suits their finger sizes and they are very light in weight. Very few adults start learning on mini-keyboards but even if they do, it is more from a cost perspective. They just want to test out themselves whether they are capable of learn the instrument before investing in a full sized keyboard.
But whatever be the case, as your keyboard skills become better over time, you will need to eventually go onto a standard size keyboard. Be it the quality of the keys, or the sounds, or the various functions, you will always find them to be more and better on a full size piano keyboard.
Here are some of the advantages of having a full size piano keyboard:
1. Lets you play exercises and songs comfortably
You can play difficult passages comfortably and at a faster pace with standard size key keys. With a mini-keyboard it is very difficult to play at a faster tempo because the keys are not very sensitive and are much smaller.
A full size piano keyboard will also have touch-sensitive keys which may not be the case with the smaller keyboards; a touch-sensitive keyboard will let you play with more expression.
2. Usually has minimum of 61 keys, which is ideal for playing with both your hands
A Full Size Piano Keyboard will have more than 61 keys which is what you need to be able to play with both your hands. You can learn harmonization since you will have more keys to use your left hand too.
3. Has good built-in speakers so the sound quality is better
A Full Size Piano Keyboard will have a good set of built-in speakers so that the output quality of the sounds is much better. You will enjoy playing the keyboard if it sounds good.
4. Have a lot of choices...from various Manufacturers.
With mini keyboards, you do not have many choices, only Casio makes them. But if you are looking for a full size keyboard, you will have plenty of choices from various manufacturers. That way you get a better deal too.
Some of the brands that you may consider are Casio-CTK, Yamaha PSR, and YPT series. If you need more than 61 keys, you may also have a look at some of the Korg and Roland models for a full size piano keyboard.