If the legs are not extra important, for normal non-fat klickies, no lifted skirts torsos, no skirts legs, you can whack them. I believe the original "Hans On" refers to actually doing that in your hand. I think some people can (I wish!). The rest of us have to whack them on something, like Tiermann said. It's fast and you don't really need much - I use a folded towel on the kitchen counter. I think this tends to mark the frame. And it IS kinda dangerous for the legs - besides the mark that can leave in both the legs and torso (you can use some card between to prevent that, but that kinda defeats the "faster" purpose, right?). You can break the legs, for stuff with two parts - like boots and shorts. For me, it's my "lazy method"
Oh, and I do get a sore hand. Sometimes I put the towel over the poppable's head, to minimize the blow to my hand (I rarely use this method for a couple of klickys).
For the newest speedos with painted heads I have started to yank them - I wrap a rubber band on the neck, put a thin cardboard ring around the head and use the pliers over that. I think the heads are more fragile or something, and I managed to mark a couple with the popper. I don't find it very practical, but oh well. Like Tiermann said, the neck/head/torso marks easily, so make sure to protect everything.
For kids, the cape + beard method is always my first choice if there is no neckpiece. If that won't do, popper. Sometimes I have a hard time popping the kids, cause there isn't much to grab - you can't grab just the legs. I have yanked a couple too.
Everything else... My popper has no restraints. Fat guys, any neckpieces, old lifted skirts, long skirts, short skirts, anything goes. It takes longer than whacking them (duh). I think my only casualties in HUNDREDS of popped klickys after using this last version of the popper (first in the kitchen doorhandle and then the popring) were those two marked speedo heads - and made a mess of one of their frames. I found that my finger gets somewhat messed up if I pop a couple of dozen klickys.. so when I have some I got something to protect it...