Ordered the treatment from ebay and did it myself today (despite advice on here not to attempt). 
Very impressed with the results, my usual dry locks are shiny and soft.
It took about 2 hours,and wasn't difficult to do, although my arms ached during the straightening stage.
Probably not suitable for anyone with sensitive eyes; it made my eyes water a bit when I was blowdrying the front of my hair.
Well worth the £25 I paid.