My order arrived to me in 18 days. Build quality looks very good. I haven't tested it yet. I will write additional feedback when I install and test the seatpost.
This seatpost is too difficult to install. To tighten the bolt that attaches the seatpost to seat, I have to use exessive force. Also there is no manual that shows how to adjust the spring. I am not sure about recomending this seatpost because of these reasons.
Seatpost now 2 months in use and very satisfied, it really dampens the shocks and saves your back !! Recommend it for all people with back problems