Coming late to this, but as someone who has rowed on/off for most of my life :
I wouldn't want a treadmill (from any brand), and I already own both a real/outdoor and a stationary bike, so I don't really want their bike.
Is the Row more focused on upper body or something?
It's one of the great myths that rowing is primarily an upper-body thing, I guess it's from rowing on fixed seats in the tubs in the park. But rowing on sliding seats is an all-body exercise, most of the power comes from thighs, glutes and back. Supposedly it uses 85% of your muscle mass, and that's reflected in eg the VO
2max as eg found by
Kim et al ("young" group average age 27, "old" group averaged 58yo)
I'm not trying to ding cycling (least of all in this thread!) - the big disadvantages of rowing are that it's not something people do as a normal part of childhood, and it is a lot more technical, and if you do it wrong then you can wreck your back. But personally I love it, and it's my preferred cardio exercise.
The Peloton rower isn't available here but just looking at it, I really like that it claims to give feedback on your rowing technique based on sensors. I don't know how well it works, but in principle that answers one of the big problems with rowing. Otherwise, meh. I get how the Peloton model works for some people, and the power of staying within an ecosystem once you're already in it, but I'm more of a numbers guy so I don't really need the pretty graphics or people shouting at me to do the work, as long as I'm given good numbers.
I'd also note that simulating the real world is less interesting for rowing - by definition you don't row up and down hills so the scenery is less varied, and you're rowing a lot slower than on a bike (but a bit faster than running) so the scenery changes more slowly. And you're looking backwards! While having someone shouting at you might work for short blasts, it's primarily an endurance sport and the way to be quick over those long pieces is to find a good rhythm, which is something that comes from within. I seldom get bored as it's technical enough that I'm always thinking about my technique, or targetting some number or other like stroke length (which comes from optimising technique), and at times I will close my eyes during a piece just to really concentrate on my technique or heart rate etc.
Concept2's are the default machines in the on-water rowing world and coming from that background that's what I've used since I was at college. So they predate the idea of having to pay monthly fees after you've bought the hardware, and have had a lot of time to get things right. For instance they've had internet recording for >20 years (by comparison Strava only came along in 2009) - and any app that caters to rowing, has to work with Concepts (eg Strava and Garmin can grab data automatically from the Concept app). And then once you're in the ecosystem you end up using the other kit - my standard cardio round is a warmup on the Concept bike, then a long piece of aerobic threshold on the rower, then a blast on the SkiErg to finish up.
In fact, if you're looking for something that's more upper body cardio, then the
SkiErg might be an option - effectively it's a Concept rower tipped on its end, you can either do it with two hands in sync for more of a mixed workout from arms to thighs that's closer to rowing, or alternate arms to push more of the work onto the arms alone. Since I've usually just come from a long session on the rower, I normally do alternate - it's definitely my love-hate thing! Another option might be a
Watergrinder which is a cross between a Waterrower and a sailing winch.