I have the Rebel 2 and it works great in my pool. Like yours, my pool does not get particularly dirty, and with the Rebel it is always clean.
Everything a suction cleaner picks up, excluding leaves if you use a leaf trap, go to the filter.
Marty's statement needs a little explaining. Yes, without a leaf catcher the debris collected by a suction-side cleaner goes to the main pump. But the pump has a basket that collects all the large things, including leaves. Particles that are smaller than the holes in the pump's basket do get to the filter.
I only clean my filter once a year, and have skipped a year once. So depending on what is falling into your pool, this might be a non-issue.
Much like you have to clean the collector of a robot periodically, same with a pressure-side cleaner, or a suction-side cleaner with a leaf trap, you'll have to pop off the lid of the pump and pull the basket and dump the leaves. Of all varieties of "dumping the junk" I believe the pump basket is the least trouble. For the other cleaner types, you have to pull the cleaner (or leaf catcher) out of the pool. You may or may not get yourself wet doing so. And with a robot, that's quite a bit of weight to haul out. You know what that's like. You also have the issue of having to pull those devices out of the pool just to
check to see how much crud they have. When leaves collect in your pump basket, it's right where you can see how much is in there, and you just pop the lid and pull out the basket.
For me,
if there is any more actual filter cleaning, that extra work is by far offset by not having to pull up the cleaner out of the water every few days, even if just to check on it. For all of off-season, and for most of swim season, I don't even think about my cleaner, at all. I pull it out of the water when guests swim, and am grateful it is so light.
I don't mind the look of the hose in the water. But I sure would be bothered by an electrical cable running across my deck.
Robots are supposed to be able to brush your pool surface and even scrub your edge tile. You'd have to get a robot owner to weigh in on if that is actually true or not, and if they actually make a difference.
Some will claim that a robot uses less electricity, because you don't need to run your main pump for them to do their thing. But my cleaning run is part of my circulation run time. The pool is still being filtered when the vac is running, so while it's true I must run my pump to clean my pool, I clean my pool while the pump would be running anyway. Now I do have to run my pump higher while the cleaner is active, so it is using more electricity. But not as much more as some robot owners would have you think.
I could not optimize the flow through my cleaner while also sucking water from my skimmer. That might be an issue for your setup, because you have two skimmers and a main drain (I just have one skimmer). I don't know if all suction-cleaner owners have this issue. I solved for that my putting an actuator on the valve that controls flow from the cleaner, so when it's cleaner time, my pool automation tells the actuator to turn and draw 80% from the cleaner and only 20% from my skimmer. Works great. It will remain to be seen if your setup will drive a suction cleaner adequately. Be prepared for some manual valve turning if not.
And lastly, if you activate the cleaner valve, you now have an additional suction port in the pool. Just be aware of that. You have many now: each skimmer, two drains, and whatever is in your spa, but those are generally protected. Skimmer suction ports are down below the skimmer baskets, and drains are much safer these days (assuming you have the dual drain setups and/or safety drain covers). But when you have a suction cleaner valve open, you have an active suction port exposed,
in the pool. Either in the wall, which is supposed to be rendered safe by a special safety port cover, or in the bottom of the suction cleaner, which is not particularly guarded, at all. For this reason, I never run the cleaner during the day, when inquisitive children might be in the pool, and my actuator disengages my suction port the rest of the time. Even when active, as I mentioned, my suction port is only drawing 80% of the flow. I left if like that in the hopes that if by some chance someone got sucked onto the port, or stuck their fingers into the hole in the vac head, that the 20% of flow coming from the skimmer would keep them from getting injured (much like how dual drains work). I've never tested this theory, but it's gotta be safer than running 100% through the vac head.
The point of all that "sharing" was to give you some idea of what you're getting into with a suction cleaner. I wouldn't use a robot if someone gave it to me. I believe my particular setup, for my particular pool, is the right choice.