The Good
Tapers and tip sizes provide versatility, flexibility is a positive benefit, good cleaning efficiency.
The Bad
Useful for 7 cases exactly. ISO25 4% file is a little weak in terms of cyclic and torsional fatigue. Shifting canal taper from 4% to 6% taper is eventually difficult.
The Bottom Line
It's a relatively better file than other comparable products and seems to be cost effective. I recommend this system if you have enough patience and the skill to use it.