I bought two packs to grow my own potatoes for the first time this year. I have recently harvested my last crop of potatoes and am very impressed with the results.
The bags require no assembly and come with full instructions (although basically all you need to do is put a couple of inches of soil in the bottom, add some seed potatoes and then top the soil up as the shoots grow). Once you have harvested the crop, the bags can be emptied and stored flat, which is great if you do not have a lot of outdoor space.
Even when full of soil (as long as not also saturated with water), I found the bags were easy to move to different locations using the side handles, so if you don't put them in the best spot to start with, it doesn't matter.
I also tried a barrel-type planter that needed to be assembled. It cost approximately the same amount as two packs of these bags but I didn't find it produced any better results and, if I had to choose between the two options, I would go for the pack of three bags every time.
I am going to buy more ready for next season and also use the bags to grow other vegetables.