I have never purchased Reebok before these but I'm glad I gave them a shot.  These are extremely comfortable.  I wear them to Step class, Turbokick and on the treadmill/elliptical.
I like the ventilation and they feel really light on the foot.  My pair did have a loose thread and it is very slowly pulling out some of the stitches near the toe of the shoe but I didn't buy them from Amazon.  I just recommend giving them a good look-over before wearing them.
I think they are pretty right on the money as far as sizing goes.  Most brands I am a 6 and it fits great.  I am going to buy an extra pair!!