M,
I believe that the Pentair IntelliFlo pump is the gold standard of pool pumps...
That said, why do you want a VS pump? Unless you have automation, a spa, or water features, where you need to have several speeds, a 2-speed pump might be a better fit for you.
One of the main advantages of a VS pump is so that you can run at a low speed most of the time and save on the electrical bill. You might have a hard time doing that with a Tab feeder, as they don't function well at low speeds.
Let's see what our other members have to say..
Thanks,
Jim R.