You are the proud owner of an enlarger that will have cost in excess of 10,000 USD (probably a lot more) when new. Forget the Leitz: it's a toy by comparison... The high end Durst enlargers (of which this one most certainly is) are among the best there are. If you only do B&W it is a bit over-kill but you don't have to use all the features.
I think there may just be someone around here who may be able to answer your questions... http://www.apug.org/forums/forum43/8426-split-second-decision-left-me-durst-ac800-elite-enlarger-seeking-info.html ...
P.S. Make sure it has all the mixing boxes and negative carriers as these are not cheap to buy new or used.
P.P.S. If you can't find a free manual, you can buy an English one here:http://www.oldtimercameras.com/stock...ModelPage=true (it's where I got the manual for my AC1200 - not a terribly good quality copy but it did the job).