Anthea, I have the strider4 and have had a lot of trouble with the damned wheels. The first pram was bent out of shape and all of the wheels didn't touch the ground, my second pram has dodgy wheels too and it rides like I have a flat tyre and Bella gets really tossed around. I got send ? new wheel on Friday so will put it on and see if it makes a diff.

I do really love it otherwise, and the only other thing that is a pain is the width. I always have to put my grogeries up and run across to the express exit to get out.
Oh, another thing that bugs me, sorry, is havin to dismantle it all the time, I wish it were just a collapsable unit.

Good luck...