I've followed a LOT of the UC threads on here, because it's a system I eventually want to move to. From what I have gathered Daniel at CCh20 advises against AN in the UC. Not 100% sure why, but I think it has to do with ph swing. I have yet to see a journal on someone using AN in the UC and having this problem, seems everyone is scared to use AN in a UC.
I personally have never used anything but AN and feel like I have done well with it. Sure I could probably get the same results using something cheaper, but I have seen "OLDSCHOOL" guys switch from SVA to AN because of lost crops.
If you look at DD's nute schedule he used it in RDWC and rocked it, which confuses me because UC is just that, a RDWC. The only differences I see are the flow, negative pressure in the UC and positive pressure in DD's system. Not sure why this would make such a big difference in ph swing.
AN, people either LOVE it or HATE it. I just ordered
Heavy 16 Bloom and I paid more for it than I pay for AN, but I am willing to try something from someone local to see what kind of results I get and to support my LOCAL economy.
At the end of the day, I for one don't mind spending more to make sure my girls are happy.