His Lv. 2 is best used in fairly close proximity, especially in 1v1. It's easy to dodge, but if you catch your opponent off balance after an attack, you should be able to get an easy kill. His down triangle can also stun, which is a decent (though not as reliable) setup for either super.
For his lv 2, I just wait til people get bunched up. Another way is bait the oppenent to attack you while guarding and quickly activate it, but theres this wierd glitch that you can get picked up right when you activate and you lose the super.
I haven't found the best solution for his Level 1, I've tried the Aerial B Launcher, but I may be a bit slow because it rarely connects for me.
As for his Level 2, I play with the opponents mind, and try to stay aerial, and when I land, and they're all grouped up. Level 2 Activate!
I avoid using his Level 3.
as for me, I always tend to use his level three. I build up at least half of level 2 so that way when I release my lvl 2, I have to do a few combos to get to lvl 1. I love using his down triangle. its great especially in 2v2 so your team mate can easily set up combos and supers.
I somehow have been timing his supers really well lately. I got 3 double kills with it in a match. I'd say besides setting it up if you get just far away enough from somebody while they're comboing you could get some good kills off that. I do wish they would extend his lvl 1's range though.