Spectra 9

Has anyone used the Spectra 9 portable breast pump? I'm debating between this and the S1.  I've done a lot of research online.  It seems like the 9 is more convenient but you sacrifice some of the suction and settings, and some reviews said the motor wore out with more frequent use.  Not sure if I should just get the S1 and lug it to work even if it's a little bulkier.  Any other working moms tried the 9 or both?