I use Skype every day... and it has become transparent to me as a voice, video and screen share meeting app. It has not yet replaced my mobile phone cell service... but I see a day when that might happen.
Meanwhile, My four star rating is due to occasional issues where a Skype call will ring on my mobile device but not my laptop. And it always seems to be the meeting where screen sharing is required. This is a small annoyance and is usually fixed by simply messaging the caller that Ill call them right back. But when its a group meeting it can be VERY annoying.
@hatchmandave about Skype for iPhone, v8.3