I was recommended Imani 2+ hands free which is more convenient than the tubed type that requires u to sit at same spot for 30-60min. And u can continue to do your normal activities while pumping any time. Got it from pupsik during 11.11 less than usual 300plus at around 250
I havent tried S1 so i cant do a comparison between the two. But ive had the dual compact since day 1 and it works perfectly for me!
Rae