I've been riding a 2012 Roam 0 with Avid hydraulic discs for the last month. I don't notice a difference in stopping power over rim brakes. Of course, I ride early in the morning on the street and seldom do any hard braking. After researching how to bleed the brakes, which is more complicated than automotive brakes, I won't get discs next time. My LBS charges $50 per wheel to bleed them. The DIY kit is around $50. I don't think changing to discs would be worth it.