Currently, I use Nike+ shoe sensor with my iPod nano to track my runs. I like it it for it's simplicity, but it's not incredibly accurate. Especially if I switch shoes.
I have been looking at moving to a Garmin, or maybe even a Suunto. Then Nike just relaeased their Tomtom watch yesterday....
I've been using the Garmin 305 for a couple years now and have absolutely no complaints, especially considering you can pick them up off of amazon.com for 130 bucks!
It always seems to be accurate enough and takes the thought out of a lot route planning and other things that delay run starts. I just strap it on and hit the trail or road and it does the rest.
So far I really like it. I use it for running and biking. I love the easy feedback on pace and HR. I'll be buying a bike mount shortly, and maybe the cadence gizmos too.
It is a bit bulky, but the price on Amazon was too good to pass up. But really you don't notice it much.
It is way more accurate and consistent than the Nike+. Although, if price was no object, I would have gone with the iPhone GPS. I looked real hard at Nike's TomTom watch too, but their pp customer service turned me off.
Thanks so much! I was temporarily enamored by the cool factor and slim design of the Nike+, but after reading reviews and getting good advice (I appreciate your input!) - I ordered the 305 just this evening.
Now I just have to decide which of Eric's plans to go with. :/
I have been using RunKeeper for about 18 months now. My significant other is still on applephone 3G whereas I am using 4 now. iPhone 4 is much more accurate and picks the signal up better. However it does require reboot every now and again (see last miles of this run - http://runkeeper.com/user/taavi/activity/41954378).
The trouble with smartphones is that do rely on AGPS (assisted GPS) whenever possible. Hence they are "so quick" to locate themselves on the map or for mobile applications. When you compare them with actual GPS that take up to 2 minutes for even warm start (depending on the model and weather conditions) you realise their location signal is not retrieved from the satellites.
I have been looking at Garmin 210. It struck me as particularly good idea again last night when running in the rain ;-). iPhone 4 is roughly £450, watch £160. Hmmm!