Yes and no. It gives you the ability to have the sound of an mpc 2000/2000xl in basic terms at your disposal. Functionality wise, the s2000 is much harder to work with though. There are ways around this, i use my s2000 all the time and it's easier to use with a computer than any mpc, with recycle and a pci scsi card. But, without that, i don't know how much i would touch it.
The s2000 is kind of a gem for it's flexibility when combined with a computer when you consider the price, over the counter ram upgrades etc. But, without a computer, again, it's not the most fun piece of gear to work with, especially coming from a modern mpc.
If you are just trying to use it to color your sound, consider the extra d/a and a/d conversion you have to do in order to record through the first device to the second. I haven't tried it but in most cases, the sound is worse than recording straight in.
What is the appeal of the 2500 over a 2000xl? Get a card reader and you have most of what most people would use given one or the other. For the same price or cheaper without the cost of the s2000 rack (negligible if you wait)
You can compare the same samples run through a 1k and an s2000 here:
http://3rdstop.com/viewtopic.php?f=6&t=608&sid=a76e61c7d749179fa37a6a85a17654f9