The Dress Box Boutique
After a couple of false starts trying to get a Role / User set up in Magento (the help documentation on Shopfiy is a bit out of date in terms of screen shots - should I had to take an educated guess) - I did manage to get the App working and it imported all my products from Magento into Shopify.
For me, it did bring the variations across for each product - size etc.
It also brought pricing, inventory, title, images etc.
The only issue that I have is that it didn't bring the all the "description" across. I can go through and cut and paste this - but I may just try support first to see if there is a quick fix.