One fill lasted me five whole camping weekends, which blew my mind compared to those little green bottles I used to toss after one dinner. The refill cost about the same as a single disposable, so it paid for itself almost immediately.
Filled it once before a four-day camping trip and it easily outlasted the three green bottles I used to burn through. The refill setup takes a little getting used to, but now each fill costs about what one disposable bottle did. Solid tank, though I wish the carry handle felt a bit sturdier.