One thing about going down in volume is how precise and accurate you have to be with hop measurements. When I was doing 1 gal batches I went to grams for hop measurements for more precision and weigh using a reloading scale for accuracy. I stopped cause I felt I was not getting enough beer for the effort on brew day. So I went back to 2.5gl batches. Of course the 5gl guys can argue the same thing about the 2.5gl batches but you get the point. Even if the beer sucked I would still drink it. Every last bit. Although I still weigh hops in grams and use the reloading scale.