No.
I really like the form factor of the classic Apex. The new Apex wouldn't even fit in my current arrangement.
If someone could tell me the difference between the new and old, I'd be glad to position myself for a future upgrade. Otherwise, it sounds like Trident is the major differentiation.
You don't need it for Trident depending on what you want to monitor. There are other alkalinity monitors/controllers already on the market. Yeah the Trident is supposed to measure calcium and magnesium, but you have to ask yourself do you really need to measure those (definitely MAG) depending on how you have your system setup. Mind you I do have 2 Apex 2016 controllers (one for DT and one for frag tank). Do not think I will be investing in the Trident unless it is able to dose those the 3 that it measures without needing to purchase 2 Neptune DOS (they only have units ATM with 2 heads so you will need at least 2 Neptune DOS to dose the 3 - MAG/CAL/ALK). That is also even if it will have the capability to communicate to the DOS to dose say 15ml of ALK or 30ml of MAG when lower than what you want it to be.
So in the instance that the Trident does communicate to the DOS, you easily looking at an additional $600 to dose those 3 elements and only have 1 available head for something else. Now if they came out with a doser that has say 4-6 heads then it may make more sense. But for now it doesn't, at least in my eyes.