My daughter would not latch on so I have to exclusively pump - takes quite a bit of my time.  Using a dual electric pump made me sit in my bedroom all by myself while pumping (can't read a book, can't go online for my hands were busy).  I was getting really sad when I had to pump (esp. if my husband or the rest of the family were doing something in the other room).  Then I found this online. I was a little skeptical as I am quite big myself and on top of it I have a very large breast and something that says XXL does not always mean XXL :)  but their size chart said it went way over my bra size so I decided to give it a try. I've used it for over a month now - daily - 6 times each day - and here're my observations so far:

1. It does fit me - and there's definitely a little adjustment room for even a bigger person.
2. It is very adjustable indeed - panels in the front and in the back - very convenient.
3. Elastic is pretty strong. I thought the holders (openings for pump) would stretch very quickly but they still support well.
4. I catch up on my facebook and menu planning and pinterest while I pump so I don't feel sad and locked up any more (I am typing this review as I am pumping).

I definitely recommend this product to anyone who is pumping (and especially those who are pumping exclusively).