I think the existing 65L pump is way more than adequate; I don't use a plate chiller or counter flow chiller. I definitely would not consider purchasing it.
Just me, but I think the current pump is more than adequate. In fact, I think one can easily collapse the grist and stick the mash with too high of a recirc rate with the current pump (ask me how I know). My Gen4 65L transfers 5.5 gallon batches to a conical, through my CF chiller, in a similar amount of time to a Chugger pump I used to use. The current pump is fine, no complaints.
Some other things that might help:
- PID 'profiles' for different batch & grain bill sizes through RAPT, and a way for brewers with similar setups & batch sizes to share them
-- Still learning, but it seems a Barleywine 5 gallon batch with 20+lb of grain might not be the same PID settings as a low gravity style 5 gallon batch
- HED to come stock with the unit
- Optionally include a Bluetooth RAPT thermometer with the unit--not that expensive, a great addition and a differentiator from other AIOs
- Put an "Initial Setup Checklist" in the instructions--useful for new and experienced AIO users (assemble, clean/passivate, set PID, calibrate, test batch, etc)
- Recommend the instructions direct new users to calibrate the temp probe in an initial setup checklist, up front, not back on page 33
- Recommend that some PID basics, explanations and recommended settings (same as in Kegland YouTube vid?) be added, much more than is on page 33
- BEERMKR pairs how-to videos to their app, a really useful thing when you are standing in front of the machine and words & pictures aren't working