I searched Ebay, and there are loads of patches available for it. Some place called Rubber Chicken, on the Net has stuff for them too. They can be upgraded memorywise, and the disk drive can also be upgraded to a SCSI CD drive.
Since posting this I've done quite a bit of looking into them, and it seems they have quite a following in some circles. The sound clips I found were quite good, too.
This one has been stored for over 10 years, and is in excelent shape and come with a bunch of sample disks.
If nothing else, it will be a fun experiment.