I reviewed the acrylic Knit Picks here. They are very similar to the Knitter's Pride, only they are clear instead of multicolored.
The acrylic interchangeables are good if you like a very lightweight needles and like the feel of a flexible needle. The acrylics tends to bend a bit when in use, which is a strange feeling when you're used to rigid needles, but then I'm a very tight knitter. However, for the price they are a fantastic set to discover whether or not you like interchangeable knitting needles. Personally, I prefer the knitter's pride cables over the knit picks so maybe they'll work out well for you.