Compare Hoover FH50222 vs FH50240 what’s the difference?

The difference between them are:
Hoover FH50240 vs FH50222
images from manufacturer

Clean Surge:
The FH50240 features Clean Surge while the FH50222 does not.

Color:
The FH50222 is red whereas the FH50240 is blue.

Price:
The FH50222 is priced at $309.99 whereas the FH50240 is priced at $299.99 at hoover.com (prices checked on July 24, 2013).

Brush Speed:
According to specifications on hoover.com,
the FH50240 has 3 brush speeds while the FH50222 has only 1 brush speed.
Not sure if the data are correct.

Auto Rinse:
The FH50240 features Auto Rinse while the FH50222 does not.
AutoRinse sets the machine to wash with detergent on forward stroke, then rinse with clean water automatically on the backwards stroke.

Download manuals to learn more:
FH50222 manual: http://hoover.com/file/909/
FH50240 manual: http://hoover.com/file/611/

If you know more difference between Hoover FH50222 and FH50240, please share here.