I just got a Aquatic Life Aquatic Life Smart Buddie Booster Pump, and I like it. Not sure how it will work over the long haul but it fine during the first week.
It is also more than just a booster pump. The output goes through it so when the back pressure goes up it shuts off. The waste water goes through it so when it starts it flushes the membrane. The input goes through it and there is a pump.
The unit produces a lot more output with less waste and the TDS has not changed. Well maybe up 1.
It is a bit more noisy with it but it lives in the basement so it's not a problem for me. If you are going to put it someplace where you can hear it noise might be a problem.