I would avoid roller blading or doing any kind of jogging or running with a stroller that does not have a fixed wheel. It can be very dangerous. The Stroller can do what is called "The Shopping Cart" effect. The front wheels will start to wobble, and could go sideways ending with disasterous results. Just ask my husband who jogged with our stroller (front swivel wheels) the other day down our drive way. The front wheel started wobbling and became lodged sideways and he almost flew over the stop of the handlebar putting our kids at risk for being hurt, not to mention his "pride" (if you know what I mean).
If you are just walking then I would highly recommend the Maclaren for taller people. I know a 6'2" guy that pushed my Maclaren with cowboy boots on, and NEVER kicked the back. The higher up version of the Maclaren also feature adjustable handlebars, IIRC.
The Volo, would not be good for a new baby because it does not recline and the seat is mesh. The Quest (which is the step up) will have more features on it then the VOLO, but it is also $100 more :thumbsdown:
Even though the front wheels lock into position on the Maclaren, don't let that full you into thinking that is safe :twocents: :thumbsup: