Never imagined the seatpost on eBay fetched but still wanted to write a review here. I have some herniated discs, but ride my bike. I thought it will not be wrong. The adapter for 31.6 mm diameter fit properly and within 10 minutes, the prop was mounted.
The driving experience is definitely different! Much more comfortable and softer. The saddle back goes I would not say. It springs pleasantly light. I think it's great and would recommend.