I've been using this harness for every session for about 6 months and it's been a great addition to my setup. The design is simple and intuitive with a 3 way closure system, its a nice assurance that your wing will stay connected.
I actually invested in this after my second experience losing a wing out on the water. During a hard crash, I somehow unclipped the buckle securing my previous waist leash from another brand, and sent my wing tumbling downwind. Luckily some friendly nearby boaters happened to be out braving the moderate wind and they retrieved my wing and brought it to me.
I do wish that the hook and loop material was a more "heavy-duty" version because the first waist closure doesn't stay attached independently for any duration, despite being a relatively large patch of material on both sides to connect. Ultimately, it doesn't affect the overall safety or function of the product, I just have to secure the secondary closure to keep the harness on while I'm setting up.
In the meantime, I'm really enjoying the benefits that riding with a harness can bring, and I thing this is a solid design from Ride Engine.