They are hard to hit but on street. On rocks, you'll probably end up with a crooked rotor after a few rides. I had dual BB5's on my bike, the brakes are just as powerful as BB7's but they didn't work too well on the rear wheel - not because of the lack of power. The problem with Avids is that you can use the speed dial knob to make the brake more powerful, but that also makes it much more spongy. The biggest issue you will encounter is that you need to completely release the lever for the rear wheel to unlock (when the speed dial is on the maximum setting). That is not good if you are used to a Magura, in which the wheel unlocks instantly... it's actually quite dangerous especially when you're doing a front wheel gap. My advice is to get a 220mm rotor and a Mono Trial. The Hope is a spongy brake, but it's not as spongy as the BB's set to have the same locking power and therefore doesn't have the problem mentioned above. Hope that made sense...