I’ve narrowed it down to spectra s1 and s2. I like how the S1 is portable, but I’ve heard of some people using an external rechargeable battery for the s2 to make it portable; however, I don’t want to do that if the voltage could ruin the pump or if it will make the pump weaker when connected to it. The S2 is completely covered by insurance. The S1 would cost me about $135. Trying to get the best option for my needs. I also have seen good things about the motif Luna, but it doesn’t seems as popular so I’m apprehensive about it.