We have had the pre 2014 Vibe stroller and second seat adaptor for almost 5 years, and love it! It attaches on the bottom below the seat, and has worked well for transporting both kids. I would definitely recommend the newer model of the vibe as it is smaller and lighter. The only reason I didn't give it 5 stars is that the straps are a little short, so they don't fit over my tall child's shoulders. The older model also doesn't have the 5 point clasp system.