Some difference between Cuisinart ice-21 and ice-30BC:
The ice-30BC is larger, holds up to 2 quarts that is 0.5 quarts more than ice-21.
The ice-21 is sold for $30 cheaper than the ice-30BC on cuisinart.com
Design of the On/Off control is different.
Freezing Time on Cuisinart ICE-30BC is shorter.
The Mixing Arm is redesigned on ice-30BC, but it is small, only scrapes one side while instead of scraping both sides like the ICE-21, thus leaves more buildup on the sides.
The ice-21 produces less ice crystals.
ICE-30BC is noisier.
Compare Cuisinart ICE-30BC and Cuisinart ICE-21
|Price||$59.95 at cuisinart.com on 2014-07-16||$89.95 at cuisinart.com on 2014-07-16|
|Capacity||up to 1.5 quarts||up to 2 quarts|
|Freezing Time||between 16 hours and 24 hours||between 6 hours and 22 hours|
|Weight||not specified||13.5 pounds|
|Dimensions||not specified||8.25" x 8.00" x 11.25"|
|Freezer Bowl||Double Insulated Freezer Bowl||Double Insulated Freezer Bowl|
|Feet||Nonslip Rubber Feet||Nonslip Rubber Feet|
|Cord Storage||Unused cord can be stored into the base.||Unused cord can be stored into the base.|
|Warranty||Limited 3-year warranty||Limited 3-year warranty|
|User Manual||User Manual||User Manual|
Overall, according to users’ experience and reviews, the ICE-30BC is easier to use, but the ICE-21 makes better ice cream.