These units are relatively cheap, and although the technology eventually becomes outdated, should last several years before it is time to trade them in for new. You don't say what the cost of the update is, but there are good stand-alone sat-navs from both Garmin and TomTom that come with free (roughly quarterly) map updates.
The map publishers seem to insist on this, presumably to protect their copyright. Can't advise on the maps, but would imagine that, as there are only, AFAIK, two providers of the mapping (Navteq and TeleAtlas), Naviextra will have bought the mapping on licence for one or other, and will have their unit locked to the licence.
You will probably get this problem, and the cost, every year.
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