While I don't currently keep 'em, I have set up vivs with the intention of keeping 'em.
From the viewpoint of someone looking to get into darts, my best advice is that once you get 'serious' about it, try putting together a viv and try culturing feeders, preferably months in advance of a potential purchase. If you are like me, you'll put 10 or more hours into designing and building a viv, and once you're finished you're going to want to redo it with a number of things you learned along the way.
We opted to not get dart froggies with our schedules that take us away for days at a time. Snakes and geckos are a much better fit for our lifestyle.
On top of that, frog temperatures are out of line for what we like for the rest of our species, especially since we seasonally cycle.