"Ignore the previous reviewer, this knife just needs better instructions on the packet! It holds two blades with a safety interlock to stop you having both blades out at once. After some initial fiddling I figured out the loading mechanism. You extend one blade holder fully, then move a small yellow lever sideways while pushing your new blade into the slot. This could be explained using words but the package has a cryptic diagram so that you can be confused in any language! Once you figure it out it works well. Much better than dismantling the knife!"
"I only had this knife 3 days and the slider for the blade broke. I can only use one side of the knift now. Plus the knife is wide so you can only use the tip of the blade. I wouldn't buy this product if your a tradesman it just won't last and there are better knifts to be had. For the diyer it's great to keep in your draw use it twice a year to sharpen your pencil and look at its beauty."
"I bought this blade as soon as i saw it thinking great. Sadly it has to be one of the poorest design ever. It is solidly constructed, but compared to other products on the market it is a nightmare to insert the blade. I have an Irwin which has a quick blade change where you can pop it open at a click of a button. This one has two hex keys, so you need to carry one around if you want to change the blade. It comes with two normal blades and two hooked ones. When I undid the two nuts to fit the blades the whole thing came apart. It took me tens minutes to put it back together again. If I have to do this every time I need to change blades then it aint going to be much use if you are a carpet fitter. It is well built but I think I shall stick to carrying two separate knives."
"An elaborate tool without function. Remove screws to fit blade and it falls in a dozen pieces for which you require two pairs of hands to try to reassemble. My advice, having learned the hard way, stick to thr old efficient, cheap Stanley knife which has stood the test of time. I would certainly not recommend the FatMax!"