My thoughts after using the ace 30l and the buffalo 40l. If you want to brew 23/25l batches without stressing and your using loads of hops the 30l version is a bit small. Now i have 2 i mash in the smaller one and boil in the larger. 35l or wort gives enough headspace to not worry about a boilover. Both great value for money in my opinion.
I'm considering one of these as a cheap SS upgrade from my plastic peco. Can you confirm that they are both weldless inside? I don't want to poison myself with lead from solder!
Another question about the variable temperature control. Can you tell if it's working by simple on/off switching which you'd probably notice if you're watching it or is it turning down (a.k.a. dimming) the supply?