Looking for feedback from someone with personal experience with a robotic cleaner that works on steps and ledges? I have an in-ground freeform gunite pool with many stairs and 2 tanning ledges. Is there a robotic cleaner that really will clean stairs and ledges? I'm currently researching the Maytronics/dolphin cleaners? There are so many options...I'm open to suggestions on other brands but am specifically looking for input from owners who have steps and/or ledges in their pool. I re-plumbed some equipment so will not be purchasing another Polaris or pressure type unit.