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.