depends on your power cost mostly if remember those things were power hugs,,it still has some use till the new 16 nm script miners come out by Innosilicon
im even building my own A2 for fun found some one with a lot of parts who willing to sell some to me part by part as i buy it,
I use a cyclone from Zeus and a grinseed g-black 25 mh both have paid for there self i just waste power kind of but it's all in fun.
This post will more then likey be moved so don't be alarmed it's in the wrong forums.
you might get 300 with it fully working on eBay here
https://bitcointalk.org/index.php?board=75.0 maybe half that fully working with two bad fans maybe 90 .