Motor Power and Performance
The 1000W versus 1100W gap is real but small; both motors handled frozen fruit and dense shakes without stalling.
Blades and Total Crushing Technology
Both pitchers use Total Crushing blades and turned ice into fine snow in seconds during our comparison. The BL660's cup blades drew frozen food down even more effectively.
Pitcher Size and Batch Capacity
The pitchers are identical: 72 ounces, 64 ounces max liquid.
Ease of Use and Cleaning
Neither machine is hard to clean when rinsed right away; a soapy-water spin cycle cleaned both in seconds. The BL610's tall jar felt awkward in a small sink, and the BL660's extra parts clutter the rack.
Noise Level
The BL610 is louder and can be heard from the next room. The BL660 is also noisy, but its faster blending keeps the noise brief.
Price and Value
The BL610 is the cheaper of the two, the BL660 costs more, and both go on sale often. The premium pays for itself with daily cup use; otherwise the BL610 is better value.
Design and Build Quality
Both bases are heavy and built for daily use, and the BL660's travel cups survived a heavy drop. The parts we watch first are the BL610's lid spring and the BL660's carafe handle.