Im the same as Kim, have the KA attatchement and even though I really love it, it's not something that I use regularly because you can't just make a spur of the moment decision to use it, it takes a couple of days prep. Another thing, it is really quite expensive to make a litre of homemade icecream. Don't get me wrong, the ice cream maker churns out some absolutely devine stuff, but could become very exy making it all the time.
If you store the freezer bowl in the freezer permanently, then you can make it at a moment's notice (well, still have to cool the mix first)

I have a Sunbeam that I got for free from freecycle. For Christmas i got the icecream maker attachment to go with my Kenwood Chef. I use it about once every couple of weeks and love it. Mainly to make Green Tea Ice cream. It's divine and so easy to make. So far I haven't made the typical custard based ones.
I do agree with what the others have said. i find the amounts it makes too small. I would love to be able to make about 4l at a time. Mine makes about 2 and that just doesn't last...