I have the 9550 and love it. One reason I got it when looking around was that it has 3 large collection basket options. It comes with a general basket, which work well. My new pool had lots of red clay silt in it, so I purchased the "fine" basket, which is good for silt/sand and after a couple of runs it was great. Also can get a leaf basket (largest holes). It climbs the walls very well. I like the little turbo jet in the rear as it will blow off dirt from my ledge that runs around the pool below the water line. When done cleaning, you can select where it will climb up the pool wall so you can lean over and pick it up by its handle. Easy to remove basket and take to where you want to rise. The caddy is nice so you can roll it all to where you want. This is my first pool and I bought it before finding this site, but have zero regrets, Love being able to go out in the morning and drop it in and come back later to a clean pool.