found this while looking on the net has anyone used this iam trying to find out how good or bad they are.

http://www.jaycar.com.au/productView.asp?ID=KC5442&CATID=25&form=CAT&SUBCATID=347

They look like an Aussy Maplins
The ecu/box of bits looks a lot more basic than a megajolt and does not have enough info on how to fit and set up
However it is cheap

The design is not Jaycars, it was published in the Australian "Silicon chip" magazine some years ago. I have the PDF's of the article somewhere. It's a fairly basic unit, but provides either two 11x11 maps or a single 15x15 map, but I don't think it does any interpolation.