I just did my first brew (5 gal) yesterday but I have to admit, this thread has me researching and interested in 1 gallon brewing! I may go get a 1 gallon carboy and get another batch going, why not do 1 gallon AND 5 gallon!? Seems like a great way to learn for someone like me.
no reason at all you cant do both. nice thing about a 1gal batch for someone starting out is that you can get yourself a nice 1gal glass jug to use as fermenter- and it comes filled with apple juice! homemade cider is another little project that's easy to do- no mashing or boiling necessary.
and depending on whether you have a fridge to ferment, you can fit more 1 gal jugs in there vs 2.5/3/5/6.5 gal fermenters/buckets. you could literally brew a small 1 gal batch every weekend and have a constant flow of different beers to drink.
for instance, i did two last weekend, and two coming this weekend. so in about 3 weeks, i'll then i have 4 beers to sample that are only 7 days different in age. helps to have them all together at the same time as opposed to having to rely on your memory or notes when trying to decide which recipe path to stay on.
-base grains + hops
- grain variation1 + hops
-base grains + hop variation
- grain variation1 + hop variation
but you could just as easily have an IPA, hefe, saison, and pale ale going at the same time.
and if you buy kits at the brew shop for 5 gal batches, just use 1/5 of the grains and hops, etc. sometimes the grains arent separated, but all you need to do is just mix the hell out of them and take 1/5 by weight.