Toralf --

> I haven't actually checked the Overland products, though...

I got mine for around $8k each, including on-site support for both the
chassis and drives.  I got quotes from three vendors, and prices were
all within a hundred dollars or so.

I'm both academic and state-service, so there may have been some 
discounts involved.

One unverified fact reported to me by one of the salesmen (truth 
value unknown):  the carousel-design libraries are extremely hard or 
impossible to service in-rack.  Whereas I've confirmed that the 
LibraryPros have one of the better rail kits and access designs I've 
encountered -- when I had to change some DIP switch settings on the 
internal AIT3 drives during testing, I could pull the library out on 
its rails, pop the top, disconnect and remove the drive, flip the 
DIPs, and have everything back together and ready to go in about five 
minutes.

YMMV, of course ...

-mgs