I purchased the medium stroller (red) for use with my dogs.
I have Border Terriers (17-21 lbs.). My older one is 14 and loves to come on walks but is not necessarily up for long walks anymore. My 2nd BT is 10 years old and is very fit but injured himself playing ball during July 2009 and I needed to limit the length of the walks for him.
I had purchased the stroller shortly after this for use with both boys.
The stroller works great. The setup of my condo means I have to collapse it going through my sliding door to my patio but it has no issue through my front door.
The main frame and structure of the stroller seem fine and are held together with a series of bolts, washers and locking nuts. I would periodically check these for coming loose. I had not done that and found that after a month and a half of regular use, they came apart. Two came loose but I have all of the parts.
The big issue with the nuts coming undone was that it put too much stress on the stroller support bar and the plastic piece on one end broke in half. I have emailed Solvit for replacement parts and will await their response.
I still believe this product is worth it, but with anything that undergoes regular use and stress, you need to check it for maintenance.
One item that I do not believe is work installing is the brake. This worked for two days and after that could not stay tight enough against the tires to work. Grass is a better braking spot than the installed brake on this stroller.