My DD was in SCN so I had to express whilst she was there. Hubby went out an bought an electric Medela just in case we would need to express at home. It got used so much I broke it as DD refused the boob at 6 wks. Rather than putting her on formula I chose to express all her feeds. So for me having one ready to go when she flatly refused the boob and the MW's couldn't get her to attach either was a godsend.

Everone is different! Do what you are most comfortable with.