GPS for runners - Fr 610 vs 620

this is one for the runners out there, I want to get my sister a new GPS watch for xmas, she currently has the forerunner 405, she really likes Garmins so I was looking at getting the 610, but is the 620 worth the extra? its quite a bit more money so not sure if it is worth it?
anyone used either?
anyone used either?
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Have you read the mammoth DCRainmaker review of the 620? It includes comparisons with the 610, so it may help you decide...
http://www.dcrainmaker.com/2013/11/garmin-forerunner-review.html
That being said, I have the 620 ordered at my local running shoe store. It is the 610 and goes well beyond that. It really is meant for someone who is quite analytical tracking their running. Tracking vertical oscillation(bounce), ground contact time and cadence. Gives an estimate of V02 max and guides workouts as well and has the HRM with it to boot.
For me having all those extra features is wonderful and gives such insightful data into your running. If you don't care about those features than you won't go wrong with the 610-both are great watches in my opinion.