Here is a list of 3 changes made:

• S2 Programmable Pre Infusion - All S2 machines, only with a direct water line connection or plumbed in only model) shipped after June 26th of 2008 have the capability to program passive pre-infusion anywhere from 1 to 8 seconds. On the Spaziale, you set the number of seconds you want for pre-infusion. When you hit the 1 cup or 2 cup button, the solenoid to the water supply opens and the water pressure from the direct water connection flows through the coffee in the portafilter basket. One would need to check the pressure of the direct water line as this can range from 30-100 pounds (depends on water company and some apartments building have different pressures). At the end of the set programmed time, the pump turns on to create a full extraction. If a customer connects a Flojet pump in place of a direct water line connection, the pump pressure will be that of the Flojet pump.
  
  Just for comparison to an E61 grouphead (also with a direct line connection or plumbed in), the lever is lifted to just before the point where the internal valve opens, but the pump switch is not depressed.
  
  On an manual E61 group, you control the pre-infusion time and water flow on a per shot basis. This allows changes on the fly, but to repeat, the user has to closely monitor the seconds on a clock/timer/stopwatch.
  
  On the Spaziale, the user can set the programmed time to work with the coffee. Once the user sets it, there is nothing as one to do except press the the button to start the brew cycle. However, if the user wants to change it, one will need to re-program the pre-infusion time.
• Programmable Off Set Differential - The S2 measures temperature of the water in the coffee boiler. This is usually higher than the temperature of the water at the grouphead. This difference is known as the differential. This feature on the S2 allows you to set the LED temperature setting on the front of the machine to be close to the temperature being delivered at the group rather than the temperature inside the group boiler. Note: This is set during the bench test of each machine prior to shipping so you don't have to invest in the expensive equipment necessary to perform the tests and setting. Please also note that different environments and different tools used for bench testing can create different differentials - so the programmed difference could be off.
• Dual Manometer - For the S2, it is no longer necessary to purchase a portafilter with a pressure gauge to either check or make adjustments to your pump's output pressure. please note that pump pressure should only be recorded when extracting espresso. It is ok for the pump pressure gauge to give different readings when not in use as it could pick up internal line pressures while idling.

Same for both models

(as of June 29, 2010)

• Now able to put on a timer - Both S1 and S2 machines can go on with optional timer.
• .9mm 4 hole steam tip - (only available per request at time of purchase of S2 machine) With this new .9mm 4 hole steam tip, it makes it easier for those circumstances where small amounts of milk are frothed. Can be purchased with either S1 or S2.
• Decreased delta - Both models react with a 0.5° Celsius difference at the temperature probe in the coffee boiler.
• Updated temperature sensing probe - Same probe is actually submerged directly into the coffee boilers on both models.
• New LED display - The S1 display shows 5° increments, from 85°-120° Celsius. The S2 Vivaldi displays in 1° increments, from 91°-97° Celsius. In both cases, you can program in 1° Celsius increments - just that it will not show in the S1. However, the S1 version has a wider band to program for more experimental use in different coffee blends.
  • 91°C = 195.8°F
  • 92°C = 197.6°F
  • 93°C = 199.4°F
  • 94°C = 201.2°F
  • 95°C = 203.0°F
  • 96°C = 204.8°F
  • 97°C = 206.6°F