Digital Save the Date, Invitations and rsvp tracking

I've been struggling with the idea of do I want to send out a digital save the date and invitations or do things the old fashion way and mail them out. I've been playing around on Green Envelope and they have nice classy looking save the dates and invitations to choose from that you can actually text to your guest. They track when each guest actually opens the invitation so that you have confirmation that they received it and read it and they also have online RSVP tracking. They don't have the option to track meal choices but I can use RSVPify to track my guest meal choices. Has anyone tried doing all announcements/invitations and RSVP tracking digitally and if so what website/app did you use and did you have good luck using them?