I found a discontinued Hultafors UK-Z at my local Screwfix at only £3.49 so gave it a try. Here it is compared my old style Stanley 99e. The UK-Z looks and feels very nicely made. It's fatter and heavier than the 99e. The screw on the side of the handle can be turned with your fingers which is pretty awesome.
Negatives. The blade retaining part looks less substantial than some other utility knives. One of the magnets, presumably used to hold the blade in place when the handles are open was not secured properly.
Due to its weight I think it would be very good for cutting carpet and plasterboard. It feels a little too unwieldy for fine trimming and opening boxes etc.
The large wheel on the side is very similar to my favorite go to knife: Stanley FatMax Pro Retractable Knife 0-10-819. It's my favorite Utility Knife for a few reasons:
1. I have large hands and like the length as well as the slight bend and nub at the end. It requires less grip pressure to hold the knife during hard cutting tasks. Similar to an axe handle with the nub at the end.
2. The way I use the knife, retractable is a must for me.
3. The large wheel allows for quick, tool free blade changes. I find myself changing blades more often which leads to faster cleaner work. I also like the way the two halves rotate on themselves and do not come apart. I can open the knife with one hand and flip or change the blade with the other hand and be back to work in a few seconds.
4. If the wheel is tightened past the closing of the halves, it will pinch the blade and keep it in what ever position it is set at. I used to think this was a design flaw, but now I realize this is a handy feature. It installs way more confidence in the blade staying put when exerting big forces.
Unfortunately, this knife seems to only be available in the UK. I regularly see it for less than 10£ on UK websites, but it runs about $30 on US eBay. I own two now and would pick up a few more on my next trip to London, but its a hassle to bring knives home as I then have to check luggage.
Anyhow, I supply Facom on demand, so I don't care too much about sales volume of this model.
make Knipex look like a bargain.... 
