We got a new bike seat last week. Unfortunately, my bike's stem is too wide for the mount to fit, so we put it on Ellen's bike instead. We're still not completely sure we're happy with this front-mount type seat, mainly because we're having trouble getting it high enough and forward enought that Ellen's legs can move freely underneath it.
As you can see in the picture, it's definitely a hit with Olivia. We had a Class-A meltdown getting her out of it when we were done riding. It's 50 degrees outside with a 30 mph headwind, but that doesn't seem to matter to the Princess one bit. She likes the view from up there!