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I have been using a Garmin 610 for just under a year and was generally happy with it, until it died completely and suddenly. Fortunately I purchased it from Amazon who immediately gave me a FULL refund as soon as it was sent back to them. What a great company!
I am now in a dilemma as to what to buy to replace it. I was dead keen on the 620 - but there seems to be a lot of bad press regarding the GPS accuracy, which as far as I am concerned is an essential strength! I have since looked at the 910XT and like it - although the lack of WiFi upload is a shame. ANT+ is just not very well suited to large transfers, in my opinion. Certainly the latest versions of Garmin Express seemed unreliable with uploading run data.
I already have a bike computer and don't run triathlons. So those features of the 910XT aren't particularly of value.
I like the analysis features of the 620 but don't attach much priority to that.
I'm really interested to hear from anybody else with experience of the 620 - would you buy it again or would you go for something else instead?