This is our favorite harness for our medium/large size mixed breeds. (50lb knee height dogs.) It's a little hard to adjust the straps while it's on the dog, but once you get it fitted it's an excellent harness, and fits really well. It's comfortable %26 secure (not much slippage on the straps,) and hard to get out of. (One of ours is an escape artist, this harness has been the best at keeping him in!)
The “traffic handle” is well made and extremely useful for grabbing/moving the dog, it's a great feature and one of the reasons I keep coming back to this harness.
They do only last us about 1 year on the energetic dog we leave outside on a tie-out cable 3-4 hours a day, he runs after things and pulls on the cable. He also pulls on walks pretty consistently. The metal ring on the back (and the area where it's attached) can get worn with rough use, we've had the ring itself snap, pull out of the material, etc. So we budget for one a year for him and keep a backup on hand.
The calmer dog has been using the same one for years.
That being said we bought a more expensive one (like a lot more expensive) one year and it also gave out in the same area even faster, I think we only had it 6 months.
So this is a great harness, if you have a strong puller and it gets heavy use the lifespan could be diminished. But it does keep ours contained and they're very comfortable, one dog wears his all day. Highly recommend!