Have just been out for first ride on the Co-Rider with my 2yr old. She and I both absolutely love it. It was very easy to fit, with clear instructions, and feels far more solid than the rear-mounted seat I used before. Very easy getting child in and out of the seat, and she feels very stable when clipped in. The front-mounted position is excellent - the child is nestled between your arms and her head is almost directly beneath my chin, which feels very natural and safe, and makes it very easy to chat away about what we're seeing as we go along, and to reassure her when she was getting a bit cold/ tired. She loved having her own handlebars to hold onto, and clearly enjoyed the feeling that she was riding the bike herself. All the stuff on their website about it not affecting the balance of the bike etc. is actually true - the ride was very natural. Unlike the criticisms I've seen for other front-mounted seats, there was no need to ride bow-legged - my knees just touched her legs at the top of each turn, but not enough to bother either of us at all.
It's definitely a seat for toddlers rather than babies - the manufacturers even say you shouldn't let the child fall asleep at all, so maybe not that practical for a long trip, but far more enjoyable for an inquisitive youngster than being sat low down in a trailer or staring at your back.
As with other reviews, there was a delay in shipping, but this was because they were out of stock after Christmas - the email communications were accurate and responded to swiftly. Having read the previous reviews, I was expecting slow service, so was pleasantly surprised.
I think it's definitely worth the money and will be recommending it to my friends.