I adore these toothbrushes and this year I included them in gift bags for 4 teenagers on my Christmas gift list, evangelizing for the Radius Big Brush cause. They are so cool and beautiful and my mouth feels amazing after I brush with them. I've used them for more than a decade, in fact pretty close to two, and I will never go back to little brushes.
My one and only complaint is that Radius is not making more colored bristles. The yellow brush with yellow bristles was the BEST EVER, and the purple brush with purple bristles was AWESOME. These brushes should all be available with matching colored bristles! They are so artistic and unique. Colored bristles just make them more gorgeous. And we could all benefit from a little more gorgeous in our lives.