The solo pads are slightly expensive and wear out quicker than average.
These would be the worst pads on the market if you were a Professional detailer doing multiple cars.
HOWEVER
They are extremely smooth to use and probably the best beginner pads on the market. The general opinion is that wool is best for defect removal and foam is best for final gloss.
So if you are only going to do your car or a couple cars only then these pads would be a good investment.
The solo liquid is pretty good. Its a moderate to high cutting compound that finishes well and has a short to medium working time. It uses similar technology to
M105 but that cuts more and has a shorter (too short) working time.
If you are new to the rotary and have a car with soft paint then i would reccomend a finer polish to use on the solo finishing pad, such as
Meguiars #3 machine glaze. The solo compound on the finishing pad is still fairly strong so it may take some practice to get right. If you have a PC or orbital buffer i'd just use that for the last step until you perfect the solo.
I've moved onto the Edge 2000 system, and as i do a lot of cars its much more cost effective for me. Less than half the price in pads for the same work done.