Naturally, it would look nice on my CV if the places I apply to in the future value teaching experience. But I'd imagine it takes at least a year or three (or +++ ???) of teaching any given course to really tighten the screws, so wouldn't I expect my first year evaluations to be sort of, well, bad-ish? And what is the point of a university investing in a teacher who won't be around long enough to get the course to the awesome level?
Also, since it's a limited engagement, I'd have to spend a good amount of time during that year applying for jobs for the following year, which could take a non-trivial amount of time away from planning 4 courses per semester, no? And speaking of future positions, I'm wondering what taking a year off from lab work looks like to hiring committees at research-heavy institutions. Obviously, it's a year with no new publications, which I worry may not be compensated for by the boost in teaching experience. Or will it?
So let's hear it--are there worthwhile benefits to the 1-year teaching position for someone still interested in doing research long-term?