Its a baseline decent shock. If you want to go fast or beat on your jeep at all, its still not enough shock.. but if you drive it to work, hit the dirt once a month or so, and just want to be able to handle the small bumps decent without ever bottoming out or jumping - they are totally the right shock for you.
Think of the 5100 series as the Blue Moon Beer of the shock world. Its sure better than drinking a bud light, but its no craft beer. You don't buy Blue Moon and expect your beer brewing friends to give you that nod of approval.. they'll recognize you aren't drinking Budweiser and want a little flavor in your life, but at the same time know that you aren't ready for the big leagues.
The 5150's are more of your Guinness or Stone brewing. Still mass production, available at every store off the shelf, but just a little more serious.
If you're expecting a shock that you would compare to a fine beer from The Bruery or Deschutes, the 5100 series shock is not the shock for you. That would be a 7000 series or 9000 series shock.
5100's are perfectly good shocks for most people.. just remember that you're still buying an $80 shock in a very expensive industry.
(that said, I drink blue moon beer, and I run 5100 shocks on my tow rig..)
