I love it! My dog loves it (I think)! I've been looking for a harness that sits a few inches behind the elbow for a couple years now (they seem hard to come by in Canada) and finally stumbled onto this gem. My dog is 27" ribcage measurement, and I went with a M/L. The six-point adjustable harness was very easy to configure to fit my dog's shape. She still scratches at it occasionally when sitting down, but I think she's just eager to get outside and generally annoyed she has to wear anything at all..!
I would recommend this harness to all folks. Just note the pricing adds up quick if you have to ship to Canada, but I am very glad this company offers that shipping option.