I bought an azada and a right angled digging fork from Get Digging, brilliant tools. I use the fork more than the azada because you don't cut the couch grass up, you sort of comb it out, great for heavily infested areas. I wouldn't hesitate to recommend them, especially if you have back problems, they are very robust and the azadas come in several different sizes. I would say the middle size is probably the most useful, not too heavy of small. Let's face it, the rest of the world uses this type of tool, so they must have something going for them!