I recently took advantage of this deal and was very happy with the price and results.
Entry level is replacement of 15 halogen downlight bulbs (MR16 or GU10) for $33 using the existing housings. There are several caveats that may result in extra costs. These include the type of transformer already in use and if it will work with the LEDs; Dimmers and the type of dimmer.
My downlight housings were looking sad and I didn't like the gymbals so I went with EcoVantage's offer of a total light and housing replacement. They also fitted 3 pin plugs in the ceiling cavity for every downlight.
Total cost to me was $495 for 33 lights which is around what it would have cost to DIY and maintain the hardwire connection.
The lights look good and the light output of the 12w warm white luminaires is as good / better than the 50w halogens I had previously.
If you have any PAR38 floodlights they will fit new LED bulbs in them too - free!
Thanks. My area is covered by both EvoVantage and Aussie Greenmarks. Anything I should be cautious with which one to go?