So, finally got the Mirra...as much as I wanted to like it...it doesn't seem to do what was expected, especially for the price. It cleans the deep end pretty well and as designed, only goes up the walls every 6th pass. But it does go up to the top. It doesn't do steps well and misses 1/3 of my shallow end..consistently after 3 different uses. It moves the water well and it works faster than my classic Aquabot (that died and I'm replacing) but not quite as well. Maybe I have to give it a little more use...not sure. The cartridge holders (2) are excellent. They are very large and very easy to clean. That's a huge plus. Bag cleaning sucks in comparison. I'll be using it more this weekend and will post an update. I tried contacting Irobot to ask them about the cleaning via a chat but since there is very little to modify on the unit (only can add or remove float pads), not really much I can expect them to do.
More to come but at this point, it's likely I'll be returning this within 2 weeks.
I'm considering the Dolphin M4 or the Dolphin DX5 Plus. I like the idea of a remote so you can get small places that are missed (no bot is perfect). Also considering the Aquabot T2 with remote. Any feedback is appreciated.