I gave them a try for a couple weeks a few years back, and but didn't find them particularly interesting. I've always dug Jim Norton's personal stories and stand-up, though.
I'd been a Stern listener ever since he hit the local airwaves in the early 90s. Kinda lost interest in the show a year after Artie Lange departed. I get the occasional hankering for the late-80s and 90s Gilbert Gottfried segments, though, which I'll listen to on YouTube every once in a while.
I'm not really into talk radio at all nowadays, pretty much just music and some local sportscasts.
Jim Norton is funny but the only thing I don't like about him is that he tries too hard to be the "middle of the road" guy. Anthony would go off on his right-wing fanatic rant and then Jimmy would bust in with something to bring down Ant from his pedestal. Opie and Anthony worked really well as a team because Anthony was always the funny, excited one and Opie was the cool and calm one.
Howard Stern is a very intelligent person but he's nowhere near as entertaining. the last time I tuned in he was going on about AGT and his favorite HBO shows. his best days were when he'd bring on Elliot Offen and when Artie Lange was on the show. I think his show has just gone down the shitter and I think it probably started when Stuttering John left