I have a couple of the lensbaby ‘sweet’ lenses and am addicted to the effect, though I’m still struggling with manual focusing and accurate placement of the ‘sweet spot’. I do like the look of the twist effect but trying to avoid purchasing any new toys for now!
If you want to try it out without too much outlay, the lensbaby spark is a fun little toy lens that I’ve taken some very nice photos with and is pretty cheap. It’s even more of a pain to focus though so you have to take lots of shots for a few keepers.