I'm not voting, but from my month thus far with a tub, its really easy to maintain husbandry. My only regret is that getting clear photos from the side is a pain, since the tub is semi-oqaque. Like the others recommend, I'm probably going to upgrade to a PVC cage at some point.
As for you tub size, I actually use a larger one for my 3-month-old and have had no problems. You just have to make sure your husbandry is on point throughout, which can be slightly more difficult in a larger environment. I just cluttered up the space with extra hides and fake plants.