I use a similar product
http://www.frost.co.uk/item_Detail.asp?productID=9220These products are not for the beginner but with some excercise you can make pretty decent welds with it. Mig and Tig welds are much stronger.
Try to take some lessons on brasing and welding if you can.
I did 3 years of nightschool(Mig and Tig welding, I have certificates) and I can tell you it helps.