I would give this 3.5-4 stars.

It does what it says and will validate the number. It will tell you the location and type.
It's great to see if leads use their personal cell number or a fixed line number.
Downside, the other info like showing the company the that belongs to the phone carrier is wrong.
It uses old companies names instead of at&t, verizon, tmobile, etc.
Wish it could be more accurate and have more info like name, gender, etc. Other wise it validates the number.

Another down thing is.. it costs you credits to download a bulk file. So 1 credit for validating and another to download into excel sheet. So if you have a good amount of numbers then your credits will diminish real quickly.