Ive always used a syncros post, from the very first generation up to their top of range titanium post .
When they came out all that was available ( top end ) where posts from either shimano, suntour & campagnolo, All made good posts, xt, xc pro & record or..., most other posts where of standard design.
The first generation only had a small decal on the rear and a very simple double bolt set up with no throw back, its the simplicity and industrial look that got my attention bitd.
Im not sure about any where else, but here in the uk back then 1990 ish, we all wanted the top end stuff that was featured in the american magazine 'mountainbike action' , and at the time the syncros post featured heavily on all the top end bikes. rocky mountain blizzards and upwards etc.
The one below is a first generation syncros post, bought in 1990 ( i done the blue anodizing ). the tioga post is just to show as an example of others who use this double bolt design , i like the tioga post, but would rather have the syncros.
yeti fro by
redfern1950s, on Flickr