Someone once wrote "Singlespeed means you're always in the wrong gear" and after riding SS for a few years I've come to agree with that sentiment. I'm now running 1x9 on my bikes, so I still get that "stand and mash" experience along with the ability to actually make steep climbs and then go fast when the trail levels outs. I'm not knocking SS, it is definitely a fun alternative to "sit and spin".