Hi Faffymum!
Don't know if you have read the FAQ yet on the baby vac website:
www.babyvac.co.za/faq.htm
My baby was totally fine with the noise of the vacuum cleaner and she was also completely fine with the sucking. It is over in about 15 seconds anyway. After that amount of time we couldn't get anything else to come out. It really is gentle. You can feel the suction on your hand and it is barely there. We put the vacuum cleaner in another room with the door closed to reduce noise although baby was totally fine with it.
It helps to spray with saline just before sucking to loosen the snot.
See also comments on Amazon:
www.amazon.com/Baby-Nasal-Aspirator-2012-Model/dp/B004JA1XB2
Our Pead did stress to make sure you clean the parts very well with warm water and soap and then afterwards sterilise in Milton solution.
A lot of the users on Amazon mentioned previously using the Nose frida and then switched to the baby vac.