Those pumps have only been available for a very short time. Anybody trying one will be a guinea pig. Except that it is the same type sensor and control as is being used on Franklins Sub and Mono Drive systems. It is misleading to say that these pumps will vary the speed to match the usage. They use a pressure switch with 1 PSI between on and off instead of a pressure transducer as other variable speed pumps have. This “switch” will actually cause the pump to start and stop as much as 45 times per minute instead of locking into a specific speed. On the submersibles this switch starting and stopping the pump 45 times per minute, or 2 million times per month cause lots of problems and failures. At least with the booster type pump there is no long shaft to break, or long wire to whip against the casing and drop pipe each time the pump torques.
25 GPM at 50 PSI is probably plenty for 6 houses. But I know you would be better off with a regular 1.5 or 2 HP jet pump, pressure tank, and pressure switch. Adding a Cycle Stop Valve will give you constant pressure and reduce the size of tank needed. This type system will last another 20-30 years like your last system did.
The Franklin 1100 looks like R2D2, and like all variable speed pumps, is designed to make money for the manufacturer. This is contrary to lasting a long time and being a good thing for the end user. If in ten years any of those are still working and if that design still exists, then I might try one. But that is not going to happen.