The Yamaha DD55 Drum Machine is on the whole pretty easy to use. Some functions, like setting the pedal sensitivity so you can program other stuff, seems a bit complicated at first because you have to use a combination of buttons.
If you like a large volume of sounds, then you would love the compact Yamaha DTXpress Drum Machine. Every type of sound that you would want to have, like snare, kick, tom, hi-hat, cymbals and percussion are produced by this machine.