I've used a couple of different lever set ups made by ARMS with good results. They do require a Picatinny type base though.
I have a set of the Leupold OD lever rings on one rifle. They are really nothing more than a Weaver type set up, they just have a "lever" instead of a knurled knob. The lever is threaded and works just like the knob, and not like a true lever type ring/mount. As Doyle said, I wouldnt trust them to just pop them on and off and be on my merry way though. I'd want to confirm zero. With the ARMS and makers like LaRue, I wouldnt have a problem with it. All of those I've owned or used have performed very well in that respect.
"If the rule you followed brought you to this,
of what use was the rule?"
“The enemy is anybody who's going to get you killed, no matter which side he is on.” - Joseph Heller