Suspension forks on MTBs but never do I want a dropper seat post .My seat posts are either high end Easton, high end Selcof carbon or high end aluminium Ritchey or Bontrager on the MTBs. High end carbon Easton , high end Selcof, high end Ritchey and high end Shimano Dura Ace seat posts on the race bikes. If the dropper seat post fails , it is a big problem. I ride older 26 wheeled MTBs and often in big size so no dropper seat post required and I always did postural study before assembling my bikes.