I found them to be a total scam. Completely unhelpful. I've had to dispute the charges for services with my bank, and their customer service agent has made threats -- in writing -- that I not contact the Australia authorities to report them. (Of course, I have.)

Note that they are available only during European hours -- so if you are in Australia, Asia, or North America, they won't necessarily be very responsive.

There are many reputable agencies to help you get a visa. My experience is that UIS isn't among them.

I applied with them for a skilled work visa. I asked them for a quote right at the start and I recommend that you do the same :) my application was a bit expensive but the services were worth it and I did get my visa. The account manager I had and the immigration team were extremely helpful and we had easy communication throughout.