Having just gotten an S40 - I too was looking at using the Brew Bag for brewing. My reasoning was the following:
- I don't have to change my current mill gap - I currently BIAB in a single vessel (Kettle on the stove or on a propane burner). My mill gap is 0.037" or 0.94mm - I would have to up my gap to about 0.05" (1.3mm) to NOT continue using the bag in my process
- No false bottom for the S40 (just yet at least) - I've contacted Grainfather and they have no current plan to implement or have a false bottom for the S40 - this, to me, is a bit of a concern if I want to do really hoppy beers and those hops end up going into the pump/recirc tube which will inevitably clog. Not something that the Brew Bag (or any bag) can solve to be honest but still a concern I have.
- I already have a good process and just want an "electric" way to brew - using BIAB suits me just fine but having to switch my equipment profiles from winter to spring/summer/fall is a pain. On top of that I tend to suck up a lot of kitchen space in the winter. So I figured I could just use the S40 as an "electric kettle" per se since I don't currently recirculate or sparge. I can always adjust my process if I want to after the fact to use the grain basket etc. but right now I don't see me doing that.
I'm still interested to see if anyone has used a bag and if so, what size bag did they use (considering Brew Bag doesn't make one specifically for the S40)
Cheers,
Dave