Balloonist question

[dead_cowboy]

Hey everyone,
I'll be lettering my own project soon (written by me, drawn by Lou Manna, thanks to a contact from Greg Scott). I'm not terribly experienced with Illustrator, though I'm more than willing to learn. I saw Balloonist and messed around with the demo a bit. Those wondering what the hell I'm talking about can check it out here.

Outside of loading art over a particular size, it seems to work pretty well. Can anyone give me a good reason why I should avoid this and just go with Illustrator (outside of it just being a good idea to learn Illustrator in general)? I'm talking about actual reasons that will affect the quality of my book, not just that it's a program for newbies that everyone makes fun of for having fewer options than Illustrator.