The problem I have with doing the small batches in those containers is that, especially if I am dry hopping, etc. it seems like the amount of sediment I get in the bottom of the fermenter is quite large compared to the usable volume of beer I end up with, and it makes it harder to rack the beer off without stirring it up. I would recommend either using a smaller diameter container, or upping the volume a bit to help with that part.
FWIW I went to the bakery at my local grocery and asked if they had some food-grade buckets they were willing to part with, and scored a 4-gallon and 2.5 gallon bucket that I now use all the time for brewing small batches. So, you might be able to find something like that.