Go to google, type sample cd in the search bar. Then filter the content on wav or akai format.
There are many points why you could want to purchase a mpc, but it's impossible to make you see why if you havent covered the basics of composing electronic music/samplism. If you cant read specs than there no point in explaining why this machine is good. Indeed, I'd say the same, why bother and stick to software. However, to give some basic key features;
1. Timing is better since the workstation has an embedded sampler, via midi means more latency.
2. Drumpads
3. Operates like a cassette recorder, but records midi/sysex instead.
4. Intuitive and Realtime sequence options.
5. Easy, but intuitive approach on producing songs.
6. Portable.
7. Doesnt crash or freeze ( OS 1.14 anyway ).
8. Etc, etc, etc.
I cant really say that I would recommend a mpc to anyone starting out, it's really up to your budget and idea's on your setup. On a low budget it can actualy just be a luxury or even unneccesary to have an mpc, but if you do have one and know how it works, well... just ask anyone in here... really, it figures why so many work with it and unexplainable why people would sell it ( noobs probably ).