Have any Jellies tried the Walkydog bicycle attachment that allows your dog to go with you on bike rides?

I have been checking out various bike attachments that allow dogs to run next to the bike in a safe way. Has anyone tried one of these and, if so, how was it?

I have watched all the videos about training your dog to do this and understand the safety issues (for me and the dog). Don’t tell me about safety stuff UNLESS you have first-hand experience.