I kept nearly buying one and then giving myself a stern talking to that there's nothing wrong with a hammer and box of clips. The other hang-up being that I didn't use Dewalt or have their batteries. I do have Milwaukee M18 batteries but not M12 and their stapler is heavier and some reviews show it is possible to staple through a cable. So for about a year I wavered.
But the last rewire was a truly horrible loft and I'd quoted very high so decided to go for it. I don't regret it. For loft work (especially), joists, or first fixing in stud work it's brilliant and good fun to use! It's one size of staple, 25mm x 19mm (available at Screwfix) so it's not really for anything you want to look super-presentable. It can staple up to 10mm T+E.
Squeeze in mid-air and the torch comes on for 20 seconds, and it only fires when both sides and the middle are pressed, making it very hard to staple through a cable.
I got it for £289 inc vat with free shipping, including 2 batteries and charger and comes in a nice big T-STAK box. I admit it's a little bit of a luxury item but it seriously speeds up some domestic 1st fixing.
Yep, domestic really. From Superlec they are £3.18 inc vat and a bit more for the splitter.
For sorting out typical kitchen-fitter downlight installs they are great.