The Active 30i and the S300i are identical in features. Only difference is the color and a slight difference in look. I have an Active 30i and I love it. I bought mine locally because I liked the convenience of taking it in and not shipping it in case it needs repair.
Here a couple of action...
Just the on/off switch or the whole control panel will stay on after each cycle. I thought that is how mine worked. I will try leaving it longer before I turn it off to test.
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That is exactly what i'm doing now also. I'm going to leave it alone longer to see if it turns...
Find a Dealer - Maytronics
Have you checked the above link. I put Valrico, FL and it appears it is around Tampa, FL. I saw one in Plant City, which looks to be about 9 miles away. There also some in Lakeland and Lutz, FL.
I have a Active 30i and I'm not sure if the control panel suppose to turn off after it completes its cycle. I'm not sure but I thought it did when I first purchased it back in April. Now it runs its cycle but the control panel stays lit and I have to manually turn it off.
The 2018 models do have a swivel. You are correct those 3 models are operationally identical. Only differences is colors and look. Why the Active 30i? Looks. lol. Mine has a swivel and it still tangles a bit but no big deal, for others they have no tangling.
That is what happen to me. Flow switch failed and even though the Swimpure was hooked up to my timer the trippers were removed because of my vs pump. It stayed on all night with no flow. I had to put the trippers on a rewire my pump to the line side of the timer.
When my pool was installed back in 2004 they did put a switch with 2 GFCI plugs right before the Intermatic timer. If I turn the switch off it cuts the power to the timer thus the swcg and the pump. I didn't know the reason for the switch but I guess it was the Florida or Broward county code.