I thought I would get one as a joke before I got Bella. Then I decided to go ahead and get one, and luckily one of the pet boutiques here have a huge selection of them and let me test Bella in them to see which she liked best. Bella's a little particular about being in confined spaces and can freak out unless she feels safe.
So I got the one she loved and picked up her 2nd choice on ebay for a very good price. I've used mine about 2 or 3x a week since I've had Bella, so maybe 20-25 times give or take stopping and taking her out to meet and greet.
It's definitely great for going to visit family for reunions (which is why Bella was in and out of her stroller alot).
A suggestion I would have would be to check craigslist and see if anyone is listing a stroller. There were 5 or 6 postings the month before I got Bella and none over $20. All looked in like new condition and were nice quality.