When I was researching this I didn't find much so I just wanted to say that I got one along with the HR-11 heart rate monitor and have about 200 miles now on it and thought I would offer up a few impressions of it. I'm on the fence about getting the cadence pickup, had that with the Flightdeck and never payed much attention to it.
It works really well, mounting is super easy, although I like the in front of the stem area from the Flightdeck days but this is OK, when Barfly releases their mount all will be well. Nice that you can switch bikes so easily.
If you turn it on and immediately start riding it doesn't like to grab the GPS signal, if you turn it on and sit for a few seconds before going it will catch it right away and be good. If you want to be exact with start stops, let it get GPS, long press the button to establish a new ride then go, then long press again when you want the ride to end.
GPS resolution seems great, as good or better than my LG Optimus G phone's GPS as it should be.
The Cateye website is pretty useless, I upload to it because it's easy but it sucks for US users, it's really just for Japanese users at the moment IMO.
If you log all your stuff with Strava, this thing is gold, just connect it to the cradle, hit the Strava button, done.
On my 2 hour rides so far I've lost one bar of battery, I'm guessing it's good for most one or two day rides without a problem, riding across the country? Bring the cradle and charge it when needed, it won't make it all the way, duh.
I started with Endomondo before going to Strava and now log both and I like to listen to music on solo rides so I still use my phone for logging Endomondo but it would be nice to have an Endomondo button too just like the Strava one. Endomondo has fallen out of my favor though, the keep removing stuff, Pro is now second tier to premium and that's a monthly thing. Thinking about just letting that die and using just Strava for everything. Endo used to be better at tracking performance history metrics but they keep taking away stuff, seems sorta dishonest.
I had the heart rate monitor go up and stick at like 199 bpm yesterday for a few minutes, I know I was there, more like the low 170's but it corrected itself after a few minutes, no big deal.
The instructions aren't the best but they made it pretty simple and pairing was easy too so again no big deal.
I'm happy with it and it seems to do exactly what it claims to, I'm so happy to not have a sensor on the bike anywhere and I wasn't about to spend Garmin money.
I don't want to race with a phone in my pocket so this is perfect for GPS logging races with one unit that you can see real time.
I'm very happy with it, if I wasn't a Strava user, I would be a little bit dissapointed having to export the files into whatever because their site does in fact stink. I'm guessing it will get better over time but it's not mature yet, for example they give you the option of MPH/KPH but when selecting MPH it still displays metric...
I do ride year round and at night so the backlight is awesome, haven't had a good test of that yet but think it will do just fine based on dark room testing.
That is all, hope this helps.