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I don't know about VoIP, but users in swedish forums haev used wlan for extensive browsing and our largest mobile magazine stated, after extensive testing, that the wifi support is excellent and stable.
A friend of mine got his N95 yesterday and walking around with the GPS outside, we managed to get repositioned every ten steps or so - very accurate in other words.
Since the US version doesn't support 3G(!) or PTT I suppose it's a slightly different phone. Maybe the WiFi and GPS issues are US-model specific?