Anyone experience problems with keepsake (3D, 4D) ultrasounds?

Lila • 🕉Writer, biker, researcher and world traveler! 💻🏍📑🗺 Twin boys due soon! 👶👶
I just read a new report by the FDA stating that keepsake ultrasounds might be dangerous to the fetus because ultrasounds heat tissue slightly and cause tiny bubbles. The only difference is that those performed by a doctor or technician last only a few minutes, while those recording video, etc. can take up to an hour or more. 
I know these are guidelines but I want to know if anyone has ACTUALLY experienced any problems or complications as a result.  
https://www.fda.gov/ForConsumers/ConsumerUpdates/ucm095508.htm