From the appearance point of view, this is a lot better than the previous interface, but sadly that's where the positives stop. I find it clumsy to navigate, features seem to be missing and clickthroughs often don't produce the expected results. I usually have to do a lot of digging to find what used to be staring me in the face.
The upload app, Garmin Express, is even more buggy than it's predecessor and steadfastly refuses to upload anything from my Forerunner 305. At home I use Linux and have found a great plugin for Firefox that just works. It's a shame that Garmin, with all of their financial and technical resources, can't or won't produce a reliable synch app that works across all platforms when somebody else can produce, in their spare time and at no cost, a better product.
I have reverted to the old interface.
And guys, seriously, you have the slowest website on the planet. Invest in some new servers. Please.
For the record I use Windows 7, Ubuntu, IE10/11, Chrome and Firefox on very fast (55MB) internet connections.