I use it to give it some feeling and effect to the disco and stuff like that. I was needed a good one since my old ones was annoying to use, they broke too often.
My old ones at the half price of AF-250, took 1h to fill an disco hall with smoke. But AF-250 did that job under a minute. And also it haven't yet overheated when using it over 3h at a decent working load (well let just say at every drop of a music)
My opinion:
Pros:
Awesome machine for the price
Quick reload
Huge amount of smoke per load
Have an own controller with some nice functions
Con:
Its big
(I haven't seen any problem with it yet, beside the size)