Anyone have the Phil and Teds double (basically a single with a second seat below)? Do you like it? Costco has it for $350 right now, which is much cheaper than the B-ready. Wondering the pros and cons and how they compare?

http://www.costco.com/phil%2526ted%27s%c2%ae-S4-Inline-Stroller-Bundle-With-Second-Seat-Doubles-Kit.product.100025131.html

http://www.amazon.com/Britax-B-Ready-Stroller-Second-Seat/dp/B0047OY0C4/ref=sr_1_7?ie=UTF8&qid=1375139505&sr=8-7&keywords=britax+b+ready+double