>>13233638For the experience? 100%. Working with a small team in a small office will allow you to learn much more than you could ever dream of learning in a large, hyperdepartmentised company. Small startups generally have a very nice environment too, compared to big corporations.
However, you'll not be able to slack around as much as you would in a larger company, and you shouldn't expect fancy paychecks.
There's also the possibility of the company turning out to be successful, and as an early and trusted worker you'd certainly be a strong candidate for raises, bonuses or leadership positions. That's an if, of course.