Cat strollers

I am considering getting a cat stroller and take my kitties out for a walk. Any advice about this? Is it a good idea and which type of strollers are best?

I have two, both are made by Pet Gear which IMO is one of the best stroller companies. The first one I got is called sometimes like Travel System Stroller, it has a detachable carrier, you can take the carrier part off and use it in the car or as a regular carrier. The base and carrier also fold up. I ended up buying a second one because my cats grew and now only one at a time will fit in that stroller, so I bought the other one from someone, I think it is the Happy Trails stroller.