I am Ti, and I find business logic way too easy in some ways, and way too challenging in others. E.g., I want to run my own e-business - easy: calculating how much profit I have to make per item and how many items I have to sell to meet my needs - this is essentially a grade school math problem for me. Hard: learning all the rules, terminology, and conventions. I would compare it to learning a foreign language or a complicated board game like Dungeons and Dragons: two things I have stunk it up like crazy at in the past. In other words, I find the mathematical side easy as hell, and learning the vocabulary brutally hard (the latter being something that might take years to learn...).
Anyway, I'd like to hear how other people use it...
Jason