I've used tacwise products in the past and am always impressed by them. These are no exception. I used them with a Metal Staple Tacker Z1-140 and after lots of usage there hasn't been a single staple jammed in the stapler nor a misfire or squint staple. They seem sturdy and and the 'heavy duty' claim seems accurate. They've coped well with repairing our cat tree, which is made of mdf and the covering takes a bit of punishment from an over enthusiastic cat on the scratching post. Sorted that out no problem.
The blurb says is a favourite of the flooring trade and I can see how that could be true, we stapled our way round a large bedroom when laying underlay and it took no time flat. It took longer to unroll the stuff than it did to staple it down. It was so easy and fast and I'm glad to have these in the toolbox now for any other little jobs around the house.