Akrapovic released...

For me the appeal is that they improve the look off the bike - sometimes.

I'm really not into the loud ones (unbaffled) as they are unpleasant for those around you. Although I'm told they might prevent the odd SMIDSY incident.

So are the Arrow ones (on ebay.co.uk). Popping up everywhere!

Good point from @erey about saving weight too - I had forgotten they are generally lighter. Mind you, I've gone for a DCT so I'm obviously not too worried about weight!

Most of these new slip-ons look great in isolation. It's just a shame the manufacturers don't provide a further part to replace the plastic Honda shield. As it stands a lot of the slip-ons don't integrate very well. Personally I don't want to replace the whole system so until there is a slip-on plus shield that integrates better I shall sit tight.