Only thing i would say is too look at the ones with a remote instead of lever underneath.
I have had Joplin seatposts with both remote and lever under saddle and I find that with the remote being next to the grip you can use it instantaneously as the trail ahead changes. If you have just come over the crest of a steep up, straight into a steep drop, the last thing you want to be doing is taking one hand of the bars and ferreting aroun d between your legs (unless you enjoy it)!
Just a personal opinion but i feel it is worth the extra cable for this. Had a few near crashes whilst messing around at the top of a slope standing up with one hand on bars and the other trying to set the saddle an inch lower.