This thing is awesome and I haven't even used it for trails yet. I have owned the Garmin Edge 510 and the 910xt. I loved the ability to use bluetooth and ANT+ with at the same time with the Edge and although thats my biggest gripe about the Fenix 2 it's nothing to loose sleep over. I have been using this for about a month now and I like it a lot better than the 910xt for a couple of reasons. 1- It does everything the 910xt does and much more, 2- It looks fantastic, 3- It seems to be a little more accurate in the swim (that could also be because I'm swimming a little better), 4- I love the option to upload my sessions straight to my iPhone. I have noticed that my longer activities (like 3 hours plus) it won't upload to my phone, I don't know why but I need to plug it into my computer to upload. This watch is perfect if your doing tri's. It looks like you might have a bit of trouble with the wetsuit but it didn't get hung up at all the few times I have used it in open water and one of those times was a race so I was in a hurry. If you already own the 910xt and your only doing triathlons you don't need to upgrade but if your looking at both and trying to decide what watch to buy for your upcoming tri season I would go with the Fenix 2 hands down especially since they are the same price.