Hey AlUUUUUUUUUUUUUUUUUu:
Before you buy, make sure you hear the Boss 770. I have the SR-16 and the 770 is much better. Not too difficult to learn; I've had three drum machines and have a general idea of programing but it's the pre-sets I go with most of the time; however, I often add drum licks to an empty track before I'm finished with the cut. I learned this from a very good keyboard/arranger/pro who is a long time friend.
It seemed like the drum-machine technology dropped out of sight after the Alesis SR-16; but, LO, the Boss [Roland] 770 came out just a few months ago and I like the chip in it but I like the sounds even more.
Lots of pre-sets plus variations plus all the other stuff a good drum deck has.
Green Hornet