These are easy to put on the stroller. However, putting the car seats on and off could be challenging. We had to mess with the handle of at least one of the car seats to get it on and off properly. It was difficult to go through some doors when we had the car seats on the strollers and sometimes it was a two person job to get stroller through some doors as a result. We used these with cybex car seats.

Easy to attach, no problems at all.

Fast shipping, look easy to install. excited to use these during the infant months- its hard to find a twin stroller that has side by side car seat install. most are tandem which I did not want. will update my review as soon as i receive my stroller!