I use it, as I like to compare few donors and decide which works best for chop, or I combine several..it is a bit messy there at donor central, but whenever I spot a mistake, duplicate image or something, I report it with link on duplicate or short info why that particular donor is bad. I think that users who upload should be more careful and take some time to do things properly like taging and description, and to upload quality donors.
For example there is no use of 2000x900px image with 12 sets of wheels, except maybe for a base for full brush...but even then I think that everyone tries to find greatest quality donor...
But with little effort from admins that could be veery useful place especially for newcomers as not everyone has a few gigabytes donor store on their PC. And ofcourse as I already mentioned, uploaders should maintain the quality of the donor central by making responsible uploads.
Cheers