http://www.mpc1000.com/
http://www.akaipro.com/int/mpc1k/
http://www.mpc-tutor.com/mpc-1000/mpc-1000.php
to answer your specific question:
"Worth Buying?
If this is to be your first MPC, then yes, it's great value for money. If you intend using commercial sounds with it (sample CDROMs etc) then you'll really need to have a computer as well, otherwise you'll have difficulty getting those sounds into the MPC 1000 - it doesn't have any way of connecting an external storage device, as the USB port can only be used to connect it to a master USB device such as a computer.
If you are an existing MPC2000Xl user, then it's a hard choice. I really don't see this as a replacement for the XL, it's too similar in features (it's basically got an XL operating system). Linking up to a computer is now nice and easy, so that's a plus, but the fact that all your PGMs will need to be re-programmed pad-by-pad is a complete nightmare! If you use sample CDs, the only way you can load the sounds into an MPC 1000 is to copy them to your computer first (if they are in Akai format, they'll have to be converted to WAV).
If you're trying to decide whether or not to get the MPC 1000 or an MPC 4000, it's not really a fair comparision. The MPC4000 is in a different league - it features a fully fledged sampler, a more robust set of sequencer features, AkSys support, use of external drives, plus dozens of other pro features. Basically these two machines are aimed at very different markets. I think the MPC 1000 will appeal to the live user due to its small size, the MPC 4000 is designed more as a studio workhorse."