I have used Cyblax exclusively for months now, he's very different from robo. Certain matchups are played completely different. It is possible that Cyblax actually beats Cyrax in the mirror. He remains largely unexplored when it comes to specific matchups and how to play them.
The resets are not harder to land than Cyrax, not at high level. The timing is different and a little more strict on certain parts but its no biggie.
Robo's unbreakable options and damage are better, but Cyblax cannot really be outzoned except for Kabal (who doesnt really outzone him either, but he does get a free 50/50 or pressure after he teleports because of how stupid the recovery of iagb is)
If you get predictable with the teleport people will start baiting it to get free pressure on you, but that also means you can bait projectiles and punish them super hard.
Its always a tense situation when Cyblax teleports next to you because of his retarded damage (second only to robo). The teleport really has odd properties, so opponents have to make a pretty dangerous decision every time you do it. If they time their pressure (or throw) so that it hits you after the invincibility wears off they have gotten the best case scenario. But if they time it early, they will hit you while you are invincible, which means that if you jab them they get "whiff punished" for 70%. They absolutely cannot cross you over at all after the teleport because you can blow them up with AAt on reaction, so they are left with just backing off. Jumping back is always dangerous against cyrax (both robo and human) so the safe move is to dash or walk back, in which case they get off clean but also sacrifice the advantage.
I've been secretly using him for a couple months now. I love him
Anything you might want to share is super welcome, very few of us playing Cyblax.