Yes - we are sooo happy with the results!
If the pregnancy is indicated as twins on the form then verifi test will try to separate them in the results but it's not guaranteed that they can. You won't necessarily get a false positive from the second sac - there needs to be a chromosonal abnormality/ microdeletion that verifi detects, and although that is likely with the second sac it may not be the case.
We wanted to do a non-invasive test rather than go straight to CVS/ amnio because for me at 43 yo there is no point to a risk assessment (with or without bloods) as my age skews everything to bad. My age gives a downs risk of 1:30! You'll probably find it difficult to find a dr/ OB agree to an invasive test like CVS/ amnio without good justification like high risk assessment from age, previous pregnancy or family medical history.
Best of Luck!