The IPBAS system is a special 2 step pre infusion cycle that conditions and also moistens the ground coffee to get the best flavor extraction with excellent crema topping. Thanks to the great functionality of the F50, you can brew from 1 to 16 oz cups of coffee in 5 different strength settings. It can also grind from five to max sixteen g of coffee, ranging in strength from extra mild to extra strong.
1) After much research, I purchased the F9 at Williams Sonoma, primarily because they used to have a policy that you could return anything, at any time, if needed. So, I figured that if ever I had an issue, I could just return it to my local Williams Sonoma and get a replacement rather than returning the machine to the factory and waiting. Turns out I did indeed have to do this once for an electrical issue, which was actually an issue I had with the wiring at the outlet--not the machine afterall! In any event, I don't think Williams Sonoma still has that same open-ended return policy. Be sure to research the return policy wherever you make your purchase!