The key with Whole Foods would appear to be whether they are designing their planned new stores to have, or at least have room and plumbing etc. for, ESFS units.
It is difficult to retro-fit stuff into existing stores--expensive and disruptive to customers. It is much easier if the systems are planned in from day 1.
If I could afford to buy all of them, I would not need to buy any of them and I sure wouldn't be spending time on the message boards!