Wow! Marketing is apparently much more important than quality and longevity. Make it look cool, with a smiley face control screen, or an electronic pressure switch and people will grab them up, even though they cost three times as much and last a fraction as long as a regular long lasting pump system. The Dab thing is a marketing gimmick for sure. Every 18 months they come up with a new "inverter" or "variable speed type pump" that is suppose to solve all the problems of the one they made 18 months ago. It never gets any better, so in 18 months they will come up with another new version that is suppose to solve all the problems again. Been hearing that for over 30 years. They will never solve all the problems with inverters or variable speed pumps, as mother nature will not let them change things like harmonics, resonance frequencies, head loss by square of speed, etc, etc. It does deliver constant pressure and uses a little 1 liter tank, which is good if you didn't have to count on the inverter for dependability, which is isn't.
The Amtrol booster uses an electronic pressure switch with only 10 PSI differential instead of 20 PSI. This requires a pressure tank twice the normal size. Since Amtrol is a manufacturer of pressure tanks, it makes perfect sense they would push a control that requires a larger tank. This is basically a traditional pressure tank/pressure switch system, which would be long lasting and dependable if it had a regular mechanical pressure switch instead of the electronic version.
A regular jet pump with a mechanical pressure switch/pressure tank is is still the most dependable. Using a Cycle Stop Valve to deliver constant pressure and make it work with a very small tank improves the only problem with these type systems by eliminating the cycling. The quote for the dependable and long lasting booster system linked to below would be about $780.00. How much were the other quotes?
https://www.lockewell.com/index.php?main_page=product_info&products_id=548
https://cyclestopvalves.com/pages/pk1a-pside-kick
