What duplicator controllers accept mixed burners?

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Joined: Dec 5 2013
Hi all, I'm new here, this is my first post. English is not my first language, please bear with me.
We have two cd/dvd duplicator towers at work. One is a Verity (IDE (ZZ 000 128) which happily accepts replacement burners of a different brand. The other, newer tower, Microboards QD-1210-03, won't accept anything other that ten identical burners, with the same firmware. Since identical replacement drives are almost impossible to find (a a decent price anyway), making it expensive.
We are in the process of getting another tower, and I wonder what experience you have with different towers/controllers? Which ones accept mixed burners? 
I've read that Systor controllers will do this. Does anyone have experience with them?
Thankful for any replies!