Has anybody tried any of these tools to trim your eyebrows yourself?

My eyebrows are so thick and dense and for the same reason they grow back really quick whenever I trim. It's not like I cannot afford to go to the salon/parlour every week but it gets really inconvenient especially with my busy and unfixed schedules. I want to try doing my eyebrows myself and see if this works. Has anybody tried out these tools? How are they and what has your experience been with them? Does it affect your browhair growth too much once you start using them?