You can program your BD to do a more thorough 3 hour cleaning, which I do. In that time, it will "polish" your water, filtering it as it if was a full filter cycle.

I had a Dolphin but the BD's suction and speed is far greater. Why not? The 3 drive motors (tracks and suction) are 3x bigger than the Dolphin's.

The remote and s/w is cruder than the Dolphin's but it still is overall a far superior unit. I haven't had to manually brush my walls in a couple of years.