The Afterburner is a seatpost-mounted trailer bike. I've always been a bit leery of this design, especially because I usually see dads (it's always dads) racing down the bike trail with their kid flopping dangerously side to side on their wobbly trailing bike. The Mundo wouldn't be able to handle a seatpost mount but I have seen a Mundo hacked to be able to hook up a Burley Piccolo. The Piccolo mounts to a specific rack, creating a much more stable ride, I'd imagine. Dorie, from Hum Of The City uses a Roland+bike on the back of their Bullitt which attaches similarly to the Piccolo.
The Afterburner hooked up easily to the Bullitt's seatpost. Since it's a pretty beefy seatpost, I had to do a bit of adjusting but it is literally just two standard allen bolts and a quick release. Within a few minutes, we were ready to ride.
I wanted to test the Afterburner out on a standard bike to see how differently it handled from being on the Bullitt.
I really enjoyed being able to help him get more exercise than he does in the cargo bike and it was much easier than letting him ride on his own in areas that didn't have very good bike infrastructure. I think that with a little more practice, I'd get used to the extra movement. It was great to have some extra space in the Bullitt box, too. Big Brother was really happy to be able to pedal and ride routes that I won't let him, yet.
On the other hand, the quick release kept hitting against my legs (more so on the Bullitt than Oscar) and I could see how the wobbliness from bike's design could cause problems. It was just a bit worse than when the boys get really rambunctious on the Mundo but if you're not used to it or prepared, even just a little added excitement from your co-pilot could send you well off your intended path. Overall, the trail-a-bike felt solidly built on it's own. I think that if it had higher gears, Big Brother's pedaling would be a bigger help.
I really like the idea of having an interim solution to allow the boys to ride but still be connected to my bike (and my riding decisions). I look forward to doing some more testing with the Afterburner and probably try it out on a couple more bikes to get a good feel for how it changes the handling. If we end up liking this set-up, I think we'd go for a Piccolo instead. I can see having a trail-a-bike as a good option for days that my dad might go pick Big Brother up from school or trips with just one child (Little Brother would still need to wait a few years, unless we went with a Weehoo) and not have to deal with a big cargo bike. It's a great idea for longer rides where kiddo still wants to pedal but you don't want to be tied into having to go at their pace or distance.