Old thread, new post. I too am considering going with a Robot (Dolphin 200 variety) but my Quattro Sport has been working fantastic until just recently. I leave mine in the pool 24/7/365 and it runs for 90 minutes each day via my automation.
The Quattro Sport was included in my build along with the booster pump, been in operation since July 2021. I just had to take it for warranty repair, they replaced the gear boxes inside as they were worn and it's good as new again. Concerning that a 8-9 month old high end cleaner needed new gears, but covered under warranty this time.
The Quattro Sport climbs my walls and scrubs (since it has front brushes like many of the robots) the tile line with no issue. My only complaint is it does not do a good job on my pool steps, it is able to get on them but does not clean them well. The dual basket media is nice, picks up leaves and small twigs very well along with sediment left behind. And as mentioned in a previous post, it picks up golf balls (we live on a course and every now and again a ball ends up in the pool and into the cleaner). It will even unscrew my return nozzles every so often, fun finding those in there.
My main issue with a robot is I would need to spend the time taking it out there, plug it in, put it in the pool, and then take it out an hour or two later. I know, real world problems, but, with my Quattro Sport I only remove it when we swim and then drop it back in that night when we're done for the day. Automation turns it on the next morning and the pool is clean and ready for the next day. It could be I invest in a robot for spot cleaning, maybe 2 times per week to see if it can get my pool cleaner than my Quattro Sport but then again, spending $600-$1000 on a robot vs manually vacuuming my pool which I usually do once a week during the season and every 2-3 weeks off season seems silly. I just vacuum to get some of the smaller sediment the Quattro misses from time to time.