My Ob never actually used one & I am a panic merchant when i am preg...
I could feel bubs kicking & knew it was all OK...

I lost a baby at 5-6wks so nothing would have detected it...

As with anything the world over some people like them some dont...

To me there is no right or wrong, just various opinions...

I actually liked my OB (no longer working) so will have to find another when #3 comes along & I hope they are as little intrusive as he was....