Its been really solid.
Purchased new from
REI. top of the line model, for a carbon frame and a dropper post. Comes with hardware to 'quick' mount to another bikes steerer tube ( an in-stack spacer).
Easy to install, and adjust. The e-mtb was purchased with the intent to take him on trails early and get him up to speed on singletrack without the worry of having to hike a bike out with him, his strider, and my mtb. XL frame for reference. He gravitated towards it very quickly, and we never used any sort of secondary attachment to it (chest harness like we use on the radwagon) He rides the wagon with assist of a chest harness and handlebar ( until his mobile napping and general impulse control improve).
We end up riding it to/from his daycare more often than using it on singletrack but he loves to ride up front vs the yepp seat that was on the radwagon (as is currently on his moms e-bike).
NOTES:
- the setup isn't fullface friendly (for the pilot), which I would like the protection for both of us due to the speeds of the emtb, the top of his helmet is too close to my chin for a fullface, but still plenty close for use with a 3/4 or half-face. I can't get more upright of a body position to open up the distance, so I just have to watch out when he wants to peg-stand ( and/or peg-stand myself) .
- On the e-mtb, the downtube is quite wide ( as its got the earlier shimano battery in it, and the stirrups rub the frame when fully extended) which is the only way i've ever had it setup, and I've got some 3M frame protectant patches I put in there.
That said, every kid is different, and he has outgrown the yepp in weight and just about in height, which is also putting him at the upper reaches of the limits of the shotgun. Kind of a bummer, as there aren't many other options at his size but to ride his strider.
So this seat will likely go for sale at some point in the coming months, to motivate him towards the strider ( which has the BB/pedal insert) to get him moving faster on his own accord.