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Too old huh... shame the 800 is expensive as hell! Could get a 705 for 95 including shipping from DE > NL but yeah, considering you're saying it's slow I might save up for the 800 or 810 then.I would say the Edge 705 is too old now and therefore very slow with latest maps. You should look for a Edge 800/810 or maybe Edge 1000.
Form a user point of view the Garmin Edge series isn't very complicated to use. Problems are often caused by a immature firmware. So if you buy a Garmin product that has just appeared on the market you need some firmware updates until most of them are sorted out.