I bought this for my acoustic guitar and this is my first leather strap I own, so can't compare to other leather straps. But comparing to nylon straps, this feels very sturdy and comfortable. One main benefit is that it's "stiffer" and doesn't bend so easily.
While using this only with my acoustic guitar, I haven't used the strap with any heavy instrument. But even without testing I'm absolutely sure that because of the width of the strap laying on your shoulder, heavy instruments will be more comfortable to carry. This may be only in my head, but it kinda feels that my guitar became lighter with this strap.
And the looks... oh the gorgeous looks. The style of the strap was one reason I chose this one. It looks absolutely stunning. Even some of my band mates became jealous after seeing this.
I have used this in our band rehearsals for four months now and will be using it on our upcoming gig. While the duration cannot be determined in couple months, I still feel this will last very long. Stitches are very well sewed and there are no "loose ends" or pre-torn parts. In other words: I consider this as a high quality craftmanship that will last long time. And this was very pleasant surprise considering the price of the strap.
The holes are very stiff as they should. I keep the strap on my guitar all the time and I haven't unplugged and plugged it many times. So I can't tell how long it will take after holes get loose. I have a feeling that they won't get loose very long time. If you are thinking about buying this strap, it's worth considering that this is not the quickest to plug to the guitar - or then get some strap locks.
I definitely recommend this strap - especially considering the low price.