Never used a slammo type in my life but following the comments on here I've decided you should try everything in life at least once ( at least thats what an ex girlfriend once told me when she had a vibrator in her hand and a wicked smile on her face)
I've ordered a couple of double ended disgorgers. Slammo one end and large normal type on the other. Had a quick look on youtube on how to use a slammo but only found a couple of old crappy videos which were of little help.
If you use them and think they're great maybe one of you could shoot a small video on your phone on how to use the slammo when unhooking carp and post it on here for those of us that have never given them a try