I owned a prior BOB model for over 7 years and put over 2,500 running miles on it (not to mention strolling around town). Needless to say, mine was getting a little worn out (although it was still in great shape because it is a BOB and these strollers are workhorses!). I was so excited at the opportunity to upgrade to the new 2016 Ironman. I noticed a difference almost immediately on my first run. The adjustable handle is genius! It allows you to tune in exactly what feels comfortable and you can easily change it for running/walking, etc. The undercarriage basket is bigger and more accessible than prior models and the child restraint works great and the loop pulls to tighten make it so easy to adjust. The tires are a good size and run well. They have tread and provide good traction without feeling bulky or cumbersome to push. The steering is also great. Prior models were a bit difficult to turn while running with the fixed wheel and this one was a breeze. In fact the entire stroller felt so light and effortless, which is exactly what I need when pushing an ever growing child while running. I love that the Ironman provides a hand brake. When running I inevitably face hills at some point and having a brake to slow the momentum created by the weight is so nice. It is a huge safety feature. Lastly, the locking brake is easier to engage on the new model. The plastic handle is large enough and more ergonomically appropriate. With my old stroller I always hurt the top of my foot trying to disengage the brake without bending down- the new design eliminates the weird metal piece and is much easier to move.
Overall I love this stroller! In full disclosure, there is one downside...In typical BOB fashion the stroller comes bare bones without any accessories. Since my old stroller was a 2009 model, the accessories I already owned wouldn't fit the new stroller (accessories for models 2011 and newer are compatible). That meant that I had to reacquire a new weather shield, handlebar console, and snack tray. On a positive note though, the newer accessories are an improvement as well. The new handlebar console even comes with a tire pump- again genius!