Yeah he's fairly decent. His problem is that even though he fares well so long as he focuses, he tends to lose that focus in a rather silly manner I cannot really describe. He challenges ROB hanging on the ledge, and sometimes it nets him an uair, but sometimes it costs him a stock as well. At other times he just randomly whiffs fsmashes, which is really uncharacteristic for the stereotypical patient and superefficient Japanese player.
He doesn't use nair nearly enough, he is really tempted to punish kinda-safe moves with dair instead, which sometimes costs him a punish (because really, dair is just that much slower). When he dòes use nair, he uses it by fully utilizing the duration of the hitbox, coming from way above and just poking with the 3% damage hit. Classy, I'd say.
Overall, he does really well but there's just the few minor, avoidable mistakes. Definitely to add to the list though, really shows important things about the matchup.
edit: Oh yeah, he uses upthrow against ROB, that's kinda nice. When you use forward throw at mid percentages, you're just giving him the ledge and you won't be able to really follow it up. Uthrow just pretty much places him in a bad spot (way in the air) and forces him to go to the ledge anyway, it's 2% less damage, but has the potential to net you anything between 15-40% through juggles and 'hurr durr ROB has exploitable weaknesses'.
TL;DR: Use uthrow at lower percentages and start using fthrow when you can actually get proper edgeguarding out of it. Not that really matters, as you can see in the vids (and as Rabbit properly takes into consideration) you won't grab ROB too often unless you catch his landing (which shouldn't happen too often since they'll often just go for the ledge, silly Robo Booster Burner Durr. Long TL;DR, isn't it?