Comparing Acrylics

A couple of weeks ago I was comparing different acrylic paints, one of them being the Artist's Loft heavy body acrylics from Michaels. I find these colours to be rather transparent (which isn't good when I want opacity) while not being transparent enough (like my Liquitex heavy body that I love) and a little slimy which makes them difficult to mix. They have been great for creating my layers of underpainting, which is fabulous as it does save me a little in the financial department (painting every day can be quite expensive). The other paints I like to use for underpainting are Brea Reese professional acrylics from WalMart and a few craft paints, though they tend to be rather chalky and better for altered books. Finally, I'm loving the Jane Davenport acrylics for portraits...really nice skin tones to mix with my Liquietex.