
I have read the Springer attachment is good.
I bought a basic Walky attachment (still £17 plus P&P) and it just wasn't flexible enough, when the dog pulled the bike went with it a bit. From what others have told me, the Springer is a lot better as it has an arm with a lot of shock absorbing ability so if the dog does pull, it is concentrated on the arm and not the bike. If that makes sense, lol.
The basic Walky would be fine if you have a dog that has no intention of pulling away from the bike - it is fixed below the saddle post thereby anchoring to your point of gravity, but if the dog does veer sideways there's no 'give'.
Just to add - I would
never attach one of these to a collar, the dog must wear a good quality harness and clipped to the ring on the back. I'm sure you would do this anyway Josh, but it has to be said for anyone else who reads this.