Sublime yarns are a couple of notches above the run of the mill. Sirdar and Wendy are okay but if you want a bit more out of your work then it is not a loss to upgrade. You will notice the difference in the feel and the finish of your work and if it is something special you are making it is well worth paying a bit more.
The reward will be justified!
Sublime comes in a small range of fibres including egyptian cotton and extra fine merino wool.