Yea, I used the Trident for 1.5 months...it really allows you to keep your pulse on the tank! After the first round of reagents ran low, I decided it was overkill for my tank and sold it for what I put into it (could have gotten more with the crazy scarcity). I don't regret using it it and found it enlightening, and should be perfect for your application, Brian. Just be warned that my Ca shot up as the reagent got low. Others have reported something similar, and likely due to sucking air.
I agree with you on being wary of auto dosing, especially after the Ca experience. That said, Neptune did a nice job of putting safeguards in for auto-dosing. I just like to observe and adjust dosing myself.