A colleague and I developed a good routine for a while. He's a much faster programmer than me. But his code quality is usually much lower (not wrong, but often poorly structured and hard to maintain). He'd code fast, I'd code slow. Then I'd clean up his stuff while we waited for feedback on the system and he did other things. Refactoring work and the like, no meaningful (to an end user) changes.

This was effective. Except that management saw him as fast and so he kept getting more work, and completing it. But the quality wasn't there because no one went in behind him to keep it clean and tidy. Management never really saw the issue, they just thought the rest of us were bad programmers because we were so slow. We were slow because: 1) some of us (like me) work slowly; 2) the fast guy introduced a lot of technical debt (or we introduced it because we weren't given the cleanup time I used to have).

He's still a good programmer (in general), but without the support structure his products are far less useful than they same at first glance (due to the introduced technical debt).