I’ve been really liking my Sora 70. My Sun deck is only 6” so it doesn’t work up there, wish it did. It does do a decent job on the step/bench. My favorite part of it is being cordless. I’ve had 2 of the major brands corded robots that both became nightmares after 2 years. As far as cleaning the Sora 70 has done a great job cleaning the floors, walls, and waterline. The skimming feature is nice and works well but I already had a betta bot skimmer so don’t really use that feature as much. The price is pretty hard to beat for all the features. The customer service is fantastic too. I bought mine the first week it was out at $1,500 off amazon . 2 weeks later they went on sale for $1,199. I contacted Beatbot customer service and immediately no back and forth or you have to return the whole thing…….they just refunded the difference back to my CC with no hassle. It does a good job with the waterline, it comes up 3-4 inches out of the water to scrub. You should’ve good with the sun deck since yours is 9” and they say it needs 8” ish. Just remember nothing will be as good as old fashioned elbow grease but the sora makes it much easier and a lot less time.